ARLINGTON -- Left-handed pitcher John Gaub became the 40th member of the Rangers' roster after being picked up off waivers from the Rays on Thursday. Since right-hander Neftali Feliz was placed on the 15-day disabled list with right elbow inflammation on Monday, Texas had carried 39 players.

Gaub will be optioned to Triple-A Round Rock, which sent right-hander Yoshinori Tateyama to the Rangers to replace Feliz on the 25-man roster.

Gaub, 27, was selected in the 21st round -- 641st overall -- by the Cleveland Indians in the 2006 First-Year Player Draft. Gaub and right-handers Chris Archer and Jeff Stevens were traded to the Cubs on New Year's Eve in 2008 for Mark DeRosa.

Gaub made his Major League debut last September and allowed two runs in 2 2/3 innings across four relief appearances, striking out three and walking two.

Those four outings represent Gaub's only experience in the big leagues. He had been picked up by the Rays, who claimed him off waivers from the Cubs on April 5. Gaub went 0-1 with a 4.32 ERA and one save in 16 appearances, all out of the bullpen, for Triple-A Durham. In 187 career appearances over six seasons in the Minor Leagues, Gaub has posted a 12-13 record and a 3.65 ERA.

Rangers promote first-rounder Matthews

ARLINGTON -- Left-hander Kevin Matthews, the Rangers' first-round pick in last year's First-Year Player Draft, was promoted to the Class A Hickory Crawdads on Thursday. In seven appearances, including three starts, with the Arizona League Rangers, Matthews went 1-0 with a 1.50 ERA.

Matthews -- ranked by as Texas' No. 11 prospect entering the season -- was 0-3 with a 2.70 ERA in five starts with the Short-Season Spokane Indians. Before his promotion, the lefty struck out 30 batters, walked 18 and held hitters to a .222 batting average across two levels this season.

Matthews was the 33rd pick of the 2011 Draft, a compensatory selection received when the Phillies signed Type A free agent and former Rangers lefty Cliff Lee before last season. Matthews was selected with the final pick of the first round out of Richmond Hill (Ga.) High School.

Worth noting

• A limited number of obstructed-view reserved seats are available for this weekend's series against the Blue Jays. More than 2,000 standing-room tickets and a limited number of scattered single reserved tickets remain for each game.

• Jason Dufner, the winner of this year's HP Byron Nelson Championship, will throw out the first pitch before Friday's series opener against the Blue Jays. Dallas Cowboys quarterback Tony Romo will throw out the first pitch before Wednesday's game against the Mariners.