1:58 PM - Luis Castillo (SEA) (hamstring) is making good progress and has thrown off a mound, but he's not expected to return for the Mariners' series against the Astros to begin the week, Shannon Drayer of SeattleSports.com reports.

11:52 AM - Luis Castillo (SEA) appears to be progressing consistently from his hamstring strain, and the Mariners remain cautiously optimistic he'll be activated when first eligible Monday, MLB.com reports. "Progressing as he should be," manager Dan Wilson said. "I don't think there's any expected date, right now, of his return, but progressing as he has. I know Luis is very diligent about getting his work in and trying to get healthy, and I think as far as we know right now, he's doing well."

6:24 PM - Luis Castillo (SEA) was placed on the 15-day injured list Tuesday due to a Grade 2 left hamstring strain, Ryan Divish of The Seattle Times reports.

5:46 PM - Luis Castillo (SEA) (hamstring) will undergo an MRI on his left hamstring on Monday in Seattle, Daniel Kramer of MLB.com reports.

4:11 PM - Luis Castillo (SEA) was removed from Sunday's game against the Cardinals due to a left hamstring strain, Shannon Drayer of SeattleSports.com reports.

7:21 AM - Luis Castillo (SEA) did not factor into the decision in Tuesday's loss to the Athletics, allowing two runs on four hits and a walk while striking out five over seven innings.

5:48 AM - Luis Castillo (SEA) (10-11) got the win over the Mets on Sunday, allowing one run on four hits and two walks while striking out nine over six innings.

9:22 AM - Luis Castillo (SEA) (9-11) took the loss Tuesday against the Tigers, allowing three runs on eight hits and no walks while striking out nine over six innings.

10:14 AM - Luis Castillo (SEA) (9-10) picked up the win Tuesday against Boston, allowing three runs on six hits and a walk across six innings. He struck out four.

7:46 AM - Luis Castillo (SEA) (8-9) picked up the win over the Angels on Thursday, allowing four hits and two walks over six shutout innings while striking out five.

5:48 AM - Luis Castillo (SEA) allowed three runs on six hits and no walks while striking out three over five innings Sunday against the Twins. He did not factor into the decision.

7:05 PM - Luis Castillo (SEA) will start Sunday's game against the Twins, Daniel Kramer of MLB.com reports.

2:18 PM - Luis Castillo (SEA) next start has been pushed back a day to Friday against the Rangers, Ryan Divish of The Seattle Times reports.

6:53 PM - Luis Castillo (SEA) (5-7) pitched five innings, allowing five runs on six hits while striking out four and walking one in Saturday's loss to the Royals.

7:39 PM - Luis Castillo (SEA) (5-6) allowed two hits and three walks while striking out six over seven scoreless innings to earn the win over the Angels on Sunday.

7:41 AM - Luis Castillo (SEA) did not factor into the decision in Tuesday's 4-2 win over the Astros, allowing two runs on five hits and a walk while striking out six in six innings.

5:51 PM - Luis Castillo (SEA) (4-6) took the loss Thursday against the Yankees, allowing two runs on seven hits and three walks over five innings. He struck out three.

8:01 AM - Luis Castillo (SEA) (4-5) picked up the win over the Athletics on Sunday, allowing two runs on seven hits and no walks while striking out eight over six innings.

7:01 AM - Luis Castillo (SEA) (3-4) earned the win over Atlanta on Tuesday, tossing seven shutout innings while allowing just three hits and a walk. He struck out seven.

10:06 AM - Luis Castillo (SEA) (1-4) earned the win Saturday, shutting out the Rockies over seven innings while allowing two hits and one walk. He struck out nine.

5:01 AM - Luis Castillo (SEA) (0-4) took the loss Sunday against the Cubs, allowing three runs (two earned) on seven hits in six innings. He struck out nine.

9:58 AM - Luis Castillo (SEA) (0-3) took the loss Monday, allowing four runs on nine hits and one walk across 5.0 innings against Toronto. He struck out six.

9:46 AM - Luis Castillo (SEA) (0-2) took the loss Tuesday against Cleveland, allowing four runs on 10 hits and a walk over 5.2 innings. He struck out seven.

1:41 PM - Luis Castillo (SEA) allowed two earned runs on three hits and two walks over 5.1 innings in a Cactus League spilt-squad tie with the Brewers on Friday. He struck out nine.

1:13 PM - Luis Castillo (SEA) Scott Servais said Monday that Castillo will start the Mariners' March 28 season opener versus the Red Sox at T-Mobile Park, Ryan Divish of The Seattle Times reports.

12:53 PM - Luis Castillo (SEA) who fired a couple of 96-mph fastballs during his Cactus League debut Monday against the Reds, is encouraged he has that level of velocity early in camp, Daniel Kramer of MLB.com reports. "It's telling me that I'm healthy," Castillo said. "We're going to continue to be in the same routine, and hopefully that velocity will keep going up."

7:08 PM - Luis Castillo (SEA) (13-7) earned the win Wednesday, allowing two runs on three hits and three walks over six innings in a 3-2 victory over the Angels. He struck out eight.

9:14 AM - Luis Castillo (SEA) did not factor into the decision Saturday, allowing five runs on eight hits and two walks over five innings in a 8-7 win over the Mets. He struck out two.

7:29 AM - Luis Castillo (SEA) (6-7) took the loss Friday, allowing three runs on four hits over five innings against the Tigers. He struck out five.

9:03 AM - Luis Castillo (SEA) (4-2) earned the win Saturday, allowing one hit and two walks over six scoreless innings during a 5-0 win over Pittsburgh. He struck out 10.

10:20 AM - Luis Castillo (SEA) (2-2) took the loss Tuesday, coughing up seven runs (five earned) on six hits -- including three home runs -- and two walks over five innings as the Mariners were downed 9-4 by the Red Sox. He struck out six.

9:31 AM - Luis Castillo (SEA) (2-1) took the loss Wednesday, giving up three runs on eight hits over five innings as the Mariners fell 4-3 to the Rangers. He struck out nine without walking a batter.

8:07 AM - Luis Castillo (SEA) did not factor into the decision Friday, allowing four runs on five hits and one walk over seven innings against the Astros. He struck out five.

9:12 AM - Luis Castillo (SEA) didn't factor into the decision in Friday's 3-2 loss to the Blue Jays, giving up two runs on six hits and two walks over five innings. He struck out four.

3:15 AM - Luis Castillo (SEA) didn't factor in the decision against St. Louis on Saturday, allowing three runs on seven hits and two walks while striking out eight batters over five innings.

7:11 PM - Luis Castillo (SEA) (2-0) allowed two hits over seven scoreless frames Sunday, striking out nine and earning a win over Colorado.

12:21 PM - Luis Castillo (SEA) moved to 1-0 after striking out six over 5.2 scoreless innings in Tuesday's 11-2 victory over the Angels. He scattered two hits and two walks in the 99-pitch outing.

10:26 AM - Luis Castillo (SEA) did not factor into the decision Thursday versus the Guardians, yielding just one hit and no walks over six shutout frames in a 3-0 victory. He struck out six.

1:24 PM - Luis Castillo (SEA) has been named the Mariners' Opening Day starter, Ryan Divish of The Seattle Times reports.

7:11 AM - Luis Castillo (SEA) president of baseball operations Jerry Dipoto told reporters Wednesday that Castillo won't pitch in the World Baseball Classic for the Dominican Republic, Daniel Kramer of MLB.com reports.

3:51 PM - Luis Castillo (SEA) will start Game 1 of the AL Wild Card Series against the Blue Jays on Friday, Ryan Divish of The Seattle Times reports.

10:16 AM - Luis Castillo (SEA) (4-2) earned the win Saturday, allowing one run on two hits and one walk over six innings against the Athletics. He struck out eight.

11:16 PM - Luis Castillo (SEA) allowed five runs on seven hits and three walks while striking out five in 5.1 innings during Sunday's loss to the Royals. He didn't factor into the decision.

2:42 PM - Luis Castillo (SEA) and the Mariners agreed to terms on a five-year, $108 million extension Saturday, Jeff Passan of ESPN.com reports.

11:50 PM - Luis Castillo (SEA) (7-5) earned the win after he pitched six scoreless innings, allowing four hits and a walk while hitting a batter and striking out nine against the Padres on Wednesday.

11:50 PM - Luis Castillo (SEA) (7-5) earned the win after he pitched six scoreless innings, allowing four hits and a walk while hitting a batter and striking out nine against the Padres on Wednesday.

8:59 AM - Luis Castillo (SEA) did not factor into the decision Wednesday, allowing three earned runs on five hits and one walk over 5.2 innings against the White Sox. He struck out eight.

8:59 AM - Luis Castillo (SEA) did not factor into the decision Wednesday, allowing three earned runs on five hits and one walk over 5.2 innings against the White Sox. He struck out eight.

10:29 PM - Luis Castillo (SEA) (6-5) allowed five hits and a walk over six shutout frames Friday, striking out four and earning a win over Cleveland.

11:39 AM - Luis Castillo (SEA) didn't factor into the decision during Saturday's 4-3 loss to Cleveland, allowing one run on four hits and one walk with 10 strikeouts in six innings.

8:01 PM - Luis Castillo (SEA) (1-1) took the loss Sunday, allowing four runs on eight hits and one walk over five innings in a 5-3 loss against Oakland. He struck out five.

10:37 PM - Luis Castillo (SEA) (5-4) picked up the win Wednesday, giving up three runs on five hits and three walks over 6.2 innings in a 7-3 victory over the Yankees. He struck out eight.

10:37 PM - Luis Castillo (SEA) (5-4) picked up the win Wednesday, giving up three runs on five hits and three walks over 6.2 innings in a 7-3 victory over the Yankees. He struck out eight.

6:36 PM - Luis Castillo (SEA) will start Wednesday's game against the Yankees, Shannon Drayer of 710 ESPN Seattle reports.

6:36 PM - Luis Castillo (SEA) will start Wednesday's game against the Yankees, Shannon Drayer of 710 ESPN Seattle reports.

10:28 PM - Luis Castillo (SEA) Mariners are acquiring Castillo from the Reds in exchange for four minor leaguers, including Noelvi Marte, Ryan Divish of Seattle Times reports.

10:28 PM - Luis Castillo (SEA) Mariners are acquiring Castillo from the Reds in exchange for four minor leaguers, including Noelvi Marte, Ryan Divish of Seattle Times reports.