Top prospect Walker earns promotion to Triple-A

Top prospect Walker earns promotion to Triple-A

SEATTLE -- It was only a matter of time before the Mariners let top prospect Taijuan Walker try his stuff at the Triple-A level. Seattle made the call Friday, promoting the right-hander from Double-A Jackson to Triple-A Tacoma, where he will start Tuesday.

Walker has been showing that he's ready for the promotion for some time, boasting a 2.46 ERA in 84 innings for Jackson. His 96 strikeouts were the second-most among all Double-A pitchers, and his 1.05 WHIP was ninth-best. In his final start, the 20-year old struck out a career-high 12 batters in 6 2/3 innings.

Walker has been regarded as one of the Mariners' best pitching prospects since they selected him 43rd overall in the 2010 First-Year Player Draft.

He is the fifth-ranked prospect in all of baseball, according to

Jacob Thorpe is an associate reporter for This story was not subject to the approval of Major League Baseball or its clubs.