Twenty teams will be in action today, including six during the afternoon. Here are notable things to watch for:
Harvey back where it started: NYM @ ARI, 9:40 p.m. ET
Matt Harvey, who made his big league debut against Arizona at Chase Field, will return there on Thursday for the first time since his debut.
With the Mets employing a six-man rotation, Harvey will be working on five days' rest, and some extra time off might work in his favor. The 26-year-old righty has given up 11 earned runs in his last two starts after allowing 12 in his first eight outings combined. The D-backs will counter with Jeremy Hellickson, who has won each of his last two starts. Hellickson has struggled at home, though, going 1-2 with a 6.58 ERA.
On your left, BAL @ HOU, 2:10 p.m. ET
Wei-Yin Chen wants some of Dallas Keuchel's winning formula. Chen has gone 1-4 this season despite logging a 3.21 ERA in his first 10 starts, and on Thursday he'll face Keuchel, the American League's Pitcher of the Month for April and May.
Keuchel gave up four earned runs in a start three times in May, but he's coming off a shutout of the White Sox in which he struck out 11. His ERA hasn't exceeded 2.00 after any start this season.
Central casting: CLE @ KC, 8:10 p.m. ET
The AL Central has become awfully interesting lately, and the Royals know they need to stay hot to keep pace with the surprising Twins. Cleveland, meanwhile, has enjoyed a resurgence behind the red-hot bat of Jason Kipnis, who was named the AL Player of the Month for May on Wednesday.
Trevor Bauer (4-2, 2.97 ERA) will lead the Tribe against veteran Chris Young, who's off to an incredible start. Young, who logged a 12-9 record and a 3.65 ERA in 30 games last season, has a 1.55 ERA after 11 outings (five starts) this year.
Play your Cards: STL @ LAD, 10:10 p.m. ET
The Dodgers handed Michael Wacha his first loss of the season on Saturday. Their reward? They have to face him again. Wacha (7-1, 2.27 ERA) has been dominant for the Cardinals this season, and he'll again face Carlos Frias, who held St. Louis to one unearned run over seven innings on Saturday.
Spencer Fordin is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.