Jacob deGrom was dominant Monday night, Brandon Nimmo had five RBIs on Tuesday, and Corey Seager hit a two-run homer Thursday. For all the talk about the role players’ big contributions as the Texas Rangers fight for the postseason, the stars need to deliver over the final 20 games of the season. They’ve started to do so on this homestand and are 3-1 after a series-opening win over the Rays. It’s a four-game series so winning the first one Thursday was critical to earning at least a series split.