Here are five players to take a look at on your fantasy baseball waiver wire for the first week of May.

5. Oakland Athletics SP Sean Manaea

Manaea made his major league debut Friday night, with a solid five full innings before hitting a wall in the sixth that saw two inherited runners score. He should stick in the big leagues, and with results that should progressively improve this could be a low-point in Manaea’s fantasy ownership.

Yahoo! Ownership: 30%

4. Baltimore Orioles SP Kevin Gausman

A shoulder issue delayed the start to Gausman’s season, and he has a 2.45 ERA with a 10:3 K/BB ratio over two starts (11 innings). There’s still breakout potential here, so now’s the time for fantasy owners to add Gausman.

Yahoo! Ownership: 39%

3. Chicago Cubs IF Javier Baez

Since being activated from the disabled list in mid-April, Baez is hitting .310 with one home run, seven runs scored and two stolen bases over 29 at-bats. A spot in the every day lineup is not imminent, as long as Kris Bryant‘s recent ankle injury doesn’t linger, but Baez offers more than enough to be worth a roster spot in mixed leagues.

Yahoo! Ownership: 35%

2. Miami Marlins IF Derek Dietrich

Dietrich is in line for more playing time with Dee Gordon serving an 80-game suspension, and he started the last two games at second base for the Marlins. He is hitting .278 with two home runs and eight RBI so far this season, over 36-at bats., so Dietrich has mixed league value in a regular role.

Yahoo! Ownership: 2%

1. Detroit Tigers SP Michael Fulmer

Fulmer made his major league debut on Friday night, allowing two runs on seven hits over five innings while getting a win. He could secure a permanent spot in the starting rotation with a solid run while Shane Greene (finger) is sidelined, so mixed league owners can add Fulmer based on upside alone.

Yahoo! Ownership: 17%