Perez (9-5, 3.64 ERA): Perez has followed up a six-game winning streak with two straight losses. He allowed three earned runs in 6⅓ innings in the Rangers' 5-1 loss to Oakland on Sunday. It was the first time Perez has lost a game when he's had a quality start. Perez has pitched like a veteran, issuing two walks or fewer in 15 of 17 starts. The only major league rookie left-hander with more wins is the Dodgers' Hyun-Jin Ryu. Perez has won five straight road games, the second-longest streak by a Texas starter behind Derek Holland's six-game streak.
Santana (9-9, 3.23): Santana has pitched well in his first season with the Royals. He is ninth in the American League in ERA. Santana had 6⅔ scoreless innings and beat Detroit on Saturday. He gave up five hits while fanning five and walking one. Santana is 5-5 with a 3.02 ERA in 14 home starts. He took a no-decision in his only start against the Rangers this season back in June, allowing an unearned run in seven innings in a 3-1 Royals loss. Santana is 6-6 with a 4.98 ERA in 28 career starts against Texas.