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Knee surgery sidelines Oakland's Balfour for 4-6 weeks

Phoenix, AZ (Sports Network) - Oakland Athletics reliever Grant Balfour is expected to miss 4-to-6 weeks after having knee surgery to repair a torn meniscus on Thursday.

Given the timeline, the club is hopeful Balfour will be available in time for Opening Day.

Balfour experienced some knee soreness near the end of 2012, a season in which he went 3-2 with a team-leading 24 saves and a 2.53 ERA. The right-hander wasn't worried because the soreness went away during the offseason, but an MRI exam revealed the tear.

02/14 18:19:12 ET