An important thing to note here is that almost all of Borucki’s struggles have come against right-handers. He’s actually been quite successful versus lefties. If you can believe it.

This season, left-handers are slashing just .133/.235/.133 against the native of Highland Park, Illinois. In addition, he’s also recorded six strikeouts, a single walk and a 66.7 per cent ground ball rate during these situations.

While facing righties, however, Borucki has enjoyed very little success as those hitters have produced a monstrous .455/.600/1.091 slash line against him. Making matters worse, he’s allowed four walks compared to just a pair of strikeouts along with a 44.4 per cent line drive rate.

If the Blue Jays could strickly use Borucki as a lefty specialist, he’d be an extremely valuable weapon in their bullpen. The problem with that, though, is teams need relievers to be effective against both types of hitters due to the three-batter minimum rule. It’s not enough to record outs versus one set or the other.

So can the former top prospect learn to be successful against righties? Not unless he improves his command, particularly involving his high-80s slider.

When a left-hander is at the plate, Borucki’s breaking ball largely finishes away from them, making it a quality swing-and-miss offering. But if a righty comes up, that same pitch is supposed to be located down and in, only it’s been missing in the heart of the zone so far.

More often than not, Borucki has struggled to keep his slider away from the middle of the plate versus righties, which is less than ideal. As a result, opponents have posted a .500 AVG, 1.500 SLG, .848 wOBA and a pair of round-trippers against it.

It gets worse for the left-hander’s breaking ball, too.

Due to its ineffective location, the opposition hasn’t endured any issues creating hard contact when it’s been thrown, leading to career-worsts in average exit velocity (93.3 m.p.h.), barrel rate against (50 per cent) and hard-hit rate against (75 per cent).

Thanks to all the hard contact Borucki’s slider has allowed, its expected metrics (.408 xAVG, 1.282 xSLG, .560 xwOBA) have mirrored its traditional figures. This suggests his breaking ball likely isn’t destined to improve any time soon.

From what we’ve witnessed thus far, the converted reliever doesn’t appear to be anywhere close to breaking through with his command against righties. What’s worse is his mid-90s sinker also likely requires an adjustment as it’s been somewhat lucky during these same spots, as it holds a .437 xAVG, a .567 xSLG and a .560 xwOBA.

There’s no denying Borucki has the stuff to perform at the big-league level, his sinker and slider can definitely play. He just simply hasn’t put together a complete effort to date. That may occur eventually in the future, but he could be hard-pressed to do so this season.

Even as talented as Toronto’s coaching staff is, especially from a pitching standpoint, assisting with Borucki’s struggles against right-handers might be too difficult to accomplish in-season. He’d have a much better chance to improve his craft in the minors, but that can’t happen unless he clears waivers first.

At this point, considering the current state of the team’s bullpen, it’s no longer beneficial to hold onto the struggling lefty anymore. They need reliable relievers that can provide length, not ones who’ll prove to be a liability.

Now might be the time to part ways with Borucki, especially if Tim Mayza – who’s been sidelined with left forearm inflammation and is eligible to be activated when healthy – is ready to return during this homestand.

But if Mayza can’t go, perhaps that could provide an opportunity for one of the other pitchers on the 40-man roster – potentially Bowden Francis, Anthony Kay or Trent Thornton. All three of these players have previously spent time in the majors earlier this season.

Either way, it seems like it’s only a matter of time before Borucki’s runs out in Toronto.