The Pirates, who began the day half a game behind St. Louis for the lead in the
Byrd, 35, is hitting .285 with 21 home runs and 71 runs batted in and will give Pittsburgh needed depth in the outfield while leadoff hitter
Buck, 33, is batting .215 with 15 home runs and 60 RBIs. Since the beginning of the 2010 season, Buck's 63 home runs as a catcher rank third in the majors. He is expected to back up Russell Martin.
Byrd is hitting .311 with 11 doubles, three triples, six home runs and 20 RBIs in his last 38 games. His presence should help an offense that is batting only .244, including.223 with runners in scoring position, the second-lowest average in the majors.
Herrera, 19, was hitting .265 with 11 home runs and 56 RBIs for Class-A West Virginia.
Outfielder Jason Kubel was designated for assignment by the Arizona Diamondbacks.
Kubel, in his ninth major league season, had been limited mostly to pinch-hitting. The left-handed batter was hitting .220 with five home runs and 32 RBIs.
Kubel, 31, was signed as a free agent in December 2011 and got off to a strong start last season before tailing off in the late stages. Still, he hit .253 with a career-high 30 home runs and 90 RBIs.
Right-hander Jeremy Hellickson was optioned by the Tampa Bay Rays to Class-A Charlotte to allow the him extra rest before the September stretch run.
Hellickson, whom Manager
Hellickson (10-8) gave up five runs in 22/3 innings, his shortest start since June 2012, in Monday's 11-1 loss at Kansas City. The 2011
San Francisco Giants outfielder Andres Torres is scheduled for season-ending surgery Wednesday.
The operation will remove bone spurs that are irritating Torres' left Achilles' tendon. The 35-year-old Torres has been hampered by the sore tendon for much of the season and was put on the 15-day disabled list Thursday.
Torres hit .250 with two home runs and 21 RBIs in 103 games.
Asked about the possibility of replacing Gibbons, Anthopoulos said "there's never been any thought on that respect at all."
Touted as a