Joe Mauer was placed on the 15-day disabled list Wednesday because of a right oblique strain, another setback for the three-time batting champion who was just finding his old swing.
The Twins made the move soon after Mauer arrived at Target Field before Wednesday's game against Kansas City and reported discomfort.
Mauer admitted his right side has been bothering him in recent days, and that he was trying nurse his way through it while remaining in the lineup. But he felt it worsen as he stroked a two-run double during a 10-2 victory over the Royals on Tuesday.
It's even more troubling to them because, after underperforming for most of the season, Mauer had started to come alive at the plate.
The double gave Mauer a 13-game hitting streak, during which he is batting .362 with six doubles and 12 RBI.
"It's been a trying year," said Mauer, who is batting .271 with two homers and 28 RBI. "Even more frustrating when you feel you are playing pretty well lately and things were going my way, turning in my direction.
"It's baseball, that's what happens. You gotta try to stay positive and when I get back out there do the same thing I was doing."
In addition to searching for his swing, Mauer missed five games in May because of a back injury and was bothered for a few more weeks by lingering soreness. He expressed his frustration over his lack of production in June. Soon after that, he began making more solid contact and added 16 points to his batting average during his hitting streak.