As the Texas Rangers return home from a six-game road trip, they need an offensive turnaround. But the Chicago Cubs will be a tough team to deal with. The Rangers (17-20) have lost their last four series and are coming off a 2-4 road trip to Detroit and New York. The Cubs (26-12) have won nine straight games. But as they come to town, Texas has caught a break. Chicago was supposed to start left-hander Matthew Boyd in the opener. But Boyd tore his meniscus and after surgery he’ll miss at least a month. Boyd said he suffered the injury while he played with his kids, which is one of those weird injuries that only seems to happen in baseball. Instead, Texas will face right-hander Ben Brown, a former starter who will make his first start of the season after 12 games in relief. So that puts the splits in the Rangers’ favor: Against left-handers: .197/.279/.280 Against right-handers: .250/.328/.406 But, the same is at home, where Texas has struggles. Those splits?…