Latest On Padres’ Pitching Staff

The Padres have weathered their shaky early-season rotation to conclude April with a strong 19-11 record. Their starting pitching group should improve within the next couple weeks, which could lead to some decisions for the front office.

Griffin Canning seems assured of a rotation spot once he’s back from last summer’s ACL tear. Canning has taken five rehab starts with Triple-A El Paso. He got to five innings and 68 pitches on Tuesday. Pitchers can spend up to 30 days on a minor league rehab assignment. Canning began his rehab work on April 4. He could make one more Triple-A start but should be activated by the beginning of next week.

Lucas Giolito isn’t too far behind. The righty consented to an optional assignment to build up after signing a one-year deal on April 22. That came with the stipulation that he be recalled within 25 days. He’ll be on the MLB roster by the middle of May at the latest. Giolito made his second start with Low-A Lake Elsinore tonight, building to 70 pitches over 4 1/3 frames. He may not need the full 25-day window.

None of San Diego’s current five starters can be optioned. Michael King isn’t going anywhere, and Randy Vásquez has nailed down his spot with an excellent April. Walker Buehler, Germán Márquez, and Matt Waldron are the three pitchers trying to hold rotation spots.

Márquez will take the ball tomorrow to open a weekend series against the White Sox. King and Vásquez round out that set. The Friars have not yet listed probable starters for next week’s road series in San Francisco — which would be Buehler’s and Waldron’s turns if they stay on their current schedule.

Buehler has a 5.40 earned run average through six starts. He’s getting ground-balls but has a modest 7.8% swinging strike rate and has only once gone beyond five innings. Márquez will make his sixth start of the year on Friday. He has two scoreless outings but has allowed four runs in each of his three other appearances while struggling with the home run ball.

The knuckleballer Waldron was blown up by the Angels and Rockies in his first two starts of the season. He had a more competitive though unspectacular outing against the Cubs yesterday, giving up three runs over five innings. The out-of-options righty has only fanned eight of 69 opponents (11.6%) since returning from a brief injured list stint.

Jeff Sanders of The San Diego Union-Tribune floats the possibility of the Friars going to a six-man rotation or using openers/tandem starts on days when King doesn’t pitch. They were off today but play on 10 straight days beginning tomorrow. After an off day on May 11, they’ll play nine consecutive games.

Of course, the drawback with a six-man rotation or tandem starts would be the need to drop to a seven-man bullpen. San Diego optioned David Morgan this evening, per the MLB.com transaction tracker. They didn’t announce a corresponding move and seem likely to activate Yuki Matsui from his season-opening groin strain tomorrow. Jeremiah Estrada began a rehab stint this week as well.

The Padres can option Kyle Hart to clear one active roster spot. Their only other optionable reliever (aside from Mason Miller) is hard-throwing rookie Bradgley Rodriguez, who has a trio of holds and has allowed only three runs across 14 1/3 innings. He’d be tough to send down. They’ve held the out-of-options Ron Marinaccio all season. He has allowed 10 runs over 16 2/3 frames in a low-leverage role.

There’s still no defined timeline on Joe Musgrove or Nick Pivetta. The former has yet to resume throwing off a mound after a setback in his recovery from elbow surgery. Pivetta went down with a flexor strain a couple weeks ago and might be months off.