Twins closer Nathan to undergo tests on elbow

Nathan felt tightness in the elbow on Saturday against Boston after facing one batter and exited the game. The Twins have not given a timetable for his return.

The 35-year-old Nathan is coming off a franchise-record 47-save season in 2009. He threw to a 2.10 ERA in 70 appearances but had to have bone spurs and loose bodies removed in his right elbow following the season.

He has appeared in at least 64 games and averaged over a strikeout per inning in each of the past seven seasons, the last six coming in Minnesota.

Over his 10-year career, Nathan has compiled 247 saves to go with a 2.75 earned-run average in 533 games -- 29 starts.