Cleveland Indians' Travis Hafner undergoes surgery, out 4-6 weeks

Cleveland Indians designated hitter Travis Hafner had surgery on his injured right knee Thursday and will miss four to six weeks, reports ESPN's Buster Olney in a tweet.

[tweet https://twitter.com/Buster_ESPN/status/208212112848330754]

Hafner went on the 15-day disabled list on Wednesday with inflammation in the knee. He's hitting a career-worst .242 in 39 games.

The 34-year-old Hafner is in the last season of a six-year, $66-million deal. The Indians have seven players on the disabled list.