Matt Harrison (back) is expected to make at least three more minor league rehab starts.

Harrison allowed just one run over 3 2/3 innings Sunday at Double-A Frisco, but the Rangers want to continue to work him back slowly. The left-hander has not pitched in a major league game since April 6 and has made only two total starts for the Rangers this season.

Matt Harrison (back) allowed one run over 3 2/3 innings in second rehab start Sunday for Double-A Frisco.

Harrison was cleared for a rehab assignment Wednesday and hasn't had any setbacks. He'll likely need another 2-3 starts in the minors before he returns from the disabled list.

Matt Harrison (back) said he expects to begin a rehab assignment Wednesday.

Harrison was the Rangers' Opening Day starter, but has been sidelined since late April after undergoing surgery to repair a herniated disc in his lower back. Assuming he avoids setbacks, he'll likely need four or five starts in the minors before he's cleared to return from the disabled list.

Matt Harrison (back) threw 50 pitches in a live batting practice on Saturday and could go on a rehab assignment soon.

"That's what I would think and what I'm hoping," Harrison said of a rehab assignment. "I'm ready to get back into a game situation." The other option is for him to throw another batting practice session before being re-evaluated. Either way, it sounds like Harrison is getting close to game action in the near future. If he continues to progress, a return late next month looks promising.

Matt Harrison (back) felt fine after throwing a session of live batting practice on Wednesday.

It was Harrison's first time facing live hitters since his second back surgery. The left-hander is aiming to join the Rangers' starting rotation by the end of August. He is scheduled to throw BP again on Saturday.

Matt Harrison (back) will throw live batting practice Wednesday.

It will be the first time he's faced hitters since two back surgeries early on in the season. Harrison was cleared after throwing 60 pitches during a bullpen session on Monday. "It definitely gave me a sense of where I'm at," said Harrison of the pen session. The lefty considers himself a week ahead of schedule but still won't return until late August.

Matt Harrison (back) threw 25 pitches at 75 percent intensity Thursday during a bullpen session.

It was his first bullpen session since two back surgeries early on in the season. Harrison will need to make it through several more before facing live hitters, but he's hoping to begin a rehab assignment in the early part of August. He likely won't be an option for the Rangers until September.

Matt Harrison (back) is hoping to begin throwing off a mound just after the All-Star break.

Harrison is currently limited to throwing long toss and playing catch off the mound. The left-hander is hoping to be back by the end of August after a pair of surgeries on his back. "We're still looking at the end of August if all goes well," said Harrison. "Maybe six or seven bullpen sessions and a couple of live batting practices and hopefully I can get in a game [on a rehab assignment] by the beginning of August. But everything has to go right for that to happen."

Matt Harrison (back) isn't expected to rejoin the Rangers until September.

Harrison will begin a throwing program on Monday, but the Rangers want him to take it extra slowly after he underwent a pair of surgeries on his back. He could throw on flat ground for 4-6 weeks before being allowed to throw off a mound, and it will likely be at least another month after that before he's built up enough endurance to rejoin the rotation.

Matt Harrison (back) will begin playing catch next week.

Harrison is currently working his way back from surgery to repair a herniated disk in his lower back. While the southpaw is making progress, he's not expected to rejoin the Rangers' rotation until well into the second half of the season.

Rangers transferred LHP Matt Harrison from the 15-day disabled list to the 60-day disabled list.

The move clears a spot for the recently-claimed Joe Benson. Harrison underwent a second back surgery in late April and is expected to be sidelined at least another two months.

Matt Harrison recently had a setback with his back that required an additional surgery on Wednesday.

Harrison underwent an operation on April 23 to repair a herniated disk in his lower back, and he began additional discomfort this week, necessitating another operation. According to T.R. Sullivan of MLB.com, the Rangers are "operating under the assumption that Harrison will pitch again this season, but he will be out for at least three months." In other words, we won't see him again until August at the earliest, and it seems like there's a good chance it will be longer than that.

Matt Harrison underwent successful surgery Tuesday to repair a herniated disk in his lower back.

Harrison had normal post-op soreness, but the pain in his legs that he had developed prior to the operation was already gone. The lefty is expected to be sidelined until after the All-Star break.

Matt Harrison will undergo surgery Friday to repair a herniated disk in his lower back.

Surgery was deemed necessary after his back failed to respond to multiple epidural injections. The Rangers won't have a clear timetable for his return until the surgery is complete, but general manager Jon Daniels estimates that he'll be sidelined until after the All-Star break. Nick Tepesch and Justin Grimm will continue to hold down rotation spots for now.

Matt Harrison received a second epidural injection in his ailing back on Saturday.

Harrison evidently is not progressing as quickly as hoped and has yet to resume throwing. He will be re-evaluated later this week before the Rangers decide which step to take next. Harrison had been hoping to return when eligible, but that's looking unlikely.

Matt Harrison received an epidural injection in his back on Sunday.

Harrison has felt better over the past two days, but the Rangers placed him on the disabled list Wednesday. The southpaw hopes to return as soon as he's eligible, but we should know more about his status in the coming days.

Rangers placed LHP Matt Harrison on the 15-day disabled list, retroactive to April 7, with a lower back strain.

Harrison was already expected to miss a start, but the Rangers have decided to play things safe early in the season. Justin Grimm will be called up to start in his place Thursday against King Felix and the Mariners.

Matt Harrison (back) is unlikely to make his scheduled start Thursday against the Mariners.

Harrison has been battling lower back soreness since his last start. He's beginning to show improvement, but the Rangers are probably going to play it safe with the 27-year-old left-hander. Harrison struggled mightily in his first two outings of the 2013 regular season.

Matt Harrison dealt with lower back soreness in his last outing but is still scheduled to make his start on Thursday.

That's assuming he doesn't encounter a setback between now and then, of course. Harrison has struggled in his first two starts this season, posting an 8.44 ERA and 1.97 WHIP. He faces the Mariners Thursday.

Despite striking out nine, Matt Harrison lost to the Astros after giving up six runs -- five earned -- in 5 2/3 innings on Sunday night.

Harrison started off with three scoreless innings, then he started leaving balls up. He departed in the sixth having allowed four runs, and Derek Lowe immediately gave up a three-run homer after taking over, inflating Harrison's ERA.