ARLINGTON -- Mariners center fielder Jarrod Dyson did not accompany the team on its seven-game road trip starting Monday against the Rangers, and instead, he will undergo season-ending surgery to repair a problem in his pelvic area that has plagued him the past three weeks.
Manager Scott Servais said the 33-year-old speedster is seeing a specialist on the East Coast later this week for the surgery. The Mariners said Dyson is dealing with a "core-muscle issue and sports hernia."
"Jarrod has decided to go ahead and have surgery," Servais said. "It's a very minor thing that won't affect him at all going forward, but he chose to go ahead and get that done at this time."
Dyson will be a free agent at the end of the season after spending one year with the Mariners, who acquired him via trade from the Royals for right-hander Nate Karns in January.
Dyson posted a .251/.324/.350 line, and he leads the Mariners with 28 stolen bases in 111 games, while also hitting a career-high five home runs with 30 RBIs.
"When he was healthy, obviously he did a lot outfield defense-wise and what he can do on the bases," Servais said. "That's his game. But unfortunately, he didn't think he could play through it, so he decided to make that decision."
Dyson is tied for fourth among all Major League outfielders in Defensive Runs Saved this season with 15, trailing only Mookie Betts of the Red Sox, Byron Buxton of the Twins and Yasiel Puig of the Dodgers. He was fifth among MLB outfielders in Ultimate Zone Rating at 10.3. He's tied for third in outfield assists with 11 behind Adam Duvall (13) and Billy Hamilton (12) of the Reds.
Dyson was on the 10-day disabled list from Aug. 19-31 with what was described at the time as a right groin strain. He tried to return in early September, playing in two games before being shut down again.
Rookie Guillermo Heredia has handled center-field duties while Dyson was dealing with the issue and has handled things well, posting a .264/.329/.362 line with six homers, 24 RBIs and 40 runs in 110 games.
The club also claimed Jacob Hannemann off waivers from the Cubs on Sept. 4 after losing Leonys Martin on a waiver claim to the Cubs. Hannemann is a 26-year-old who showed good speed and defense in the Minors, but he only has one Major League at-bat to his name.
"He'll be our guy. He's been our guy the last three weeks anyway, so we'll continue to run him out there," Servais said of Heredia. "We'll see where we're at. As we get deeper into this thing, we might give Hannemann a game. He's a left-handed bat and we'll see what we've got there, so it might create a little bit of an opportunity for somebody like that to play a little bit."