Tomokazu Oka, who won 51 major league games after being cast aside as a failure in Nippon Professional Baseball, has decided to retire, an informed source said Monday.The 41-year-old Oka, who last pitched in the majors in 2009 with the Cleveland Indians, had been attempting to reinvent himself as a knuckleballer. He went to spring training this season with the Baltimore Orioles but failed to make the team.Since March, he waited for an offer that failed to materialize. The third round pick of the Yokohama BayStars in 1993, Oka appeared just 34 times and earned just one win with the first tea…READ FULL ARTICLE