In the two weeks since he made the switch to left field, Blake Swihart’s made the transition look seamless.

He’s handled caroms off the Green Monster, cut off balls in the corner, thrown out runners at third, and essentially made all the plays you could ask of a left fielder at Fenway Park.

When Toronto’s Michael Saunders shot a fly ball toward the left field corner in the seventh inning of the Sox’s 6-4 win Saturday, it looked like Swihart would make another one.

Even as the ball sailed toward the wall fronting the grandstand in foul territory, Swihart chased after it at full speed.

Initially, Swihart appeared to make the grab, crashing into the wall in the process. But he crumpled to the warning track right after.

His left foot jammed into base of the wall, bending at a 45-degree angle.

Sox manager John Farrell came out of the dugout immediately with team trainers to check on him.

“It wasn’t pretty,’’ Farrell said.

Swihart managed to walk off the field on his own power. As he did, officials overturned the catch, seeing on replays that he trapped it off the wall.

The Sox were left to figure out the extent of Swihart’s injury.

“We don’t know exactly what’s taken place yet,’’ Farrell said.

Meanwhile, Ryan Hanigan, who had been dealing with neck soreness for the past two weeks, left the game in the seventh when the issue crept up again.

“He was battling not only the knuckleball, but obviously his neck,’’ Farrell said. “So both are going to go for tests here and once we get information on them, we’ll have a better read on the severity of both.’’

With the possibility of both players missing time, outfielder Rusney Castillo and catcher Sandy Leon were taken out of Pawtucket’s game yesterday.

A hold on Uehara

For most of the four years that Koji Uehara’s been in Boston, he’s been responsible for preserving leads.

When he became the Red Sox’ setup man this season, not much about his job description was different. His first 14 appear­ances of the season came when the Sox were either ahead or tied.

But in the past three weeks, that’s role started to change slightly, and Uehara’s found himself coming in with the Red Sox trailing and in need of a shutdown inning.

The three times he’s taken the mound with the Sox behind, Uehara’s given up four runs and two homers.

“I know Koji’s probably most accustomed to pitching when we have a lead or a tie,’’ Farrell said. “But there are going to be occasions where we need him to pitch a quality inning late in the game.’’

The Sox were down, 3-1, to the Blue Jays Friday night when Uehara came on to start the eighth inning. After striking out the first batter, he gave up a walk and a two-run homer to Devon Travis that essentially sealed the Sox’ 5-3 loss.

It was the third homer Uehara’s allowed this season. All of them have come in his last seven appearances. He’s 0-1 with an 8.53 ERA in that span. Uehara’s 4.57 ERA is the highest of his career. The 41-year-old righthander has thrown 21? innings in 23 appearances this season compared with 17 innings in 20 appearances through June 4 last season.

Farrell said he didn’t believe Uehara’s workload was taking a toll on him.

“If you look at the usage, it’s not been overuse,’’ Farrell said. “[Friday night] was not one of his better outings as we know. He was not as sharp as we’ve seen for many, many times he’s been on the mound. But can’t say that it’s been from overuse. That’s monitored very closely, particularly Koji more than anybody else in our bullpen.’’

Oddly, almost all the damage done to Uehara this season has come at the hands of the Blue Jays, a team he’s typically dominated. In 36 lifetime appearances against the Jays, Uehara has a 2.95 ERA and 48 strikeouts. But eight of the 11 runs Uehara’s allowed this season were scored by the Jays, and they also tagged him for two of the three home runs he’s given up.

“You get back in the division where there’s a lot of familiarity, and it comes down to execution,’’ Farrell said. “To me, right now, his velocity was down a tick [Friday] night, the action to the split was not as consistent.

“Any time you have a high-leverage guy and the performance has been a little bit inconsistent, sure that’s going to give reason to have some concern. But it’s not from a physical standpoint or even the case of overuse. I can’t say that that’s what it is right now.’’

Power outage

Hanley Ramirez went 0 for 4 in the Red Sox’ 6-4 win Saturday, putting his batting average at .282. Ramirez has gone 86 at-bats without a homer, and 58 at-bats without an extra-base hit.

The power that Ramirez has shown throughout his career has been conspicuously absent.

Ramirez has just four homers this season. His last homer was a two-run shot against the A’s on May 10. Since blasting 10 home runs last April, he’s hit just 13 in 136 games.

“A year ago in April, it was 10 and it was looking like he was maybe having a year where he might have his highest total,’’ Farrell said. “There’s been a lot made of the collision into the wall last year, but we made a very specific request of Hanley to get back to the line-drive hitter that he’s been through most of his career. There’s been some of that, and yet I still think there’s some timing things that have been inconsistent to allow the power to translate.’’

Shaw snaps back

Travis Shaw came into Saturday’s game in the middle of a small slump. In five games prior to Saturday, Shaw was 3 for 20 with seven strikeouts, and he hadn’t driven in a run since May 28. His batting average dropped from .329 on May 17 to .285.

Part of it, Farrell said, was because of the way pitchers were approaching him.

“He’s been pitched to with a pretty consistent attack plan,’’ Farrell said. “There’s been some pitchers with some velocity that have elevated up and away from him. They make him conscious of velocity inside and a good change of speeds. There’s been more straight changeup where you’ve got some deception off a fastball. So he’s in one of those periods of times right now where he hasn’t gotten many mistakes on the plate.’’

Shaw was back on track Saturday, doubling to lead off the second. He drove in Xander Bog­aerts in the fifth inning, but was thrown out trying to stretch his hit into a double.

Good neighbor

Before the game, Blue Jays pitcher R.A. Dickey came across the field to the Red Sox dugout to check on David Ortiz. Dickey dotted Ortiz with a knuckleball Friday night and came over to assure Ortiz that it wasn’t intentional.

Ortiz showed no ill effects. After going 2 for 2 with two doubles Friday, he went 1 for 3 with two RBIs Saturday.

Julian Benbow can be reached at jbenbow@globe.com. Follow him on Twitter @julianbenbow.