Yankees closer Mariano Rivera missed almost the entire 2012 season due to a torn ACL, but he's committed to come back and according to Andrew Marchand of ESPNNewYork.com, Rivera will probably start his throwing program next week even though his knee isn't at 100 percent yet. “It is not 100 percent,” the 43-year old reliever said . “I would say it is 95 percent, but, by the time spring training finishes, it will be 100 percent. “It needs more strengthening,” Rivera said. “The five percent will come quick.” Rivera is the all-time saves leader with 608 and probably will go down as the best reliever baseball has ever seen. His career record is 76-58 with a stellar 2.21 ERA, 0.5 HR/9, 2.0 BB/9 and 8.3 SO/9 in 1,219.2 innings. Image by Keith Allison under the Creative Commons License Agreement.