The Mariners have called up one of their top pitching prospects, Taijuan Walker. Walker will make his major league debut Friday at Houston. You can read the M's news release below:

SEATTLE, Wash. -- Seattle Mariners Executive Vice President & General Manager Jack Zduriencik announced today the club will select right-handed pitcher Taijuan Walker from AAA Tacoma and the 21-year-old will make his Major League debut Friday at Houston.

Walker, 21, will wear #27 when he takes the mound on Friday. The official roster move will be made Friday prior to the 5:10 p.m. PT/7:10 pm CT game at Houston s Minute Maid Park.

Walker is the Mariners top pitching prospect and was listed by as the No. 5 prospect in baseball heading into the 2013 season. In 25 starts split between AA Jackson and AAA Tacoma, Walker has combined to go 9-10 with a 2.93 ERA (46 ER, 141.1 IP) and is averaging 10.19 strikeouts per 9.0 innings pitched (160 strikeouts). Walker is tied for 4th among minor league pitchers in strikeouts.

The 6-4, 210-pound right-hander pitched in the All-Star Futures Game and was selected as a Southern League All-Star. In four minor league seasons he has combined to go 23-26 with a 3.49 ERA and recorded 400 strikeouts (9.69 K/9.0 IP).

Walker was originally selected by Seattle in the supplemental first round (43rd overall) in the June Amateur Draft. He is a native of Yucaipa, CA.

When Walker makes his debut Friday, he will be 21 years, 17 days old (turned 21 Aug. 13), becoming the 5th-youngest player in Mariners history to make his MLB Debut as a starting pitcher.

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