The Rangers have a rapidly growing bottom of the rotation problem

For the first 70 games of the season, the Texas Rangers were able to boast a complete starting pitching rotation that featured five players delivering quality start after quality start.

In the last two weeks, however, a combination of injuries to Nathan Eovaldi and Tyler Mahle and sub-par performances from Jack Leiter and Patrick Corbin has the organization looking like there may be some holes popping up toward the back-end of the once sturdy staff.

Jack Leiter and Patrick Corbin have struggled over their last few starts

The Rangers still are high on Leiter because of his live arm and a plus assortment of breaking pitches. They aren't going to panic over his recent struggles, fully aware that he is still learning how to be a big-league pitcher, but it is noteworthy that he is 0-2 in his last two starts and has given up 10 earned runs over 9 innings pitched.

Maybe more concerning are the six walks he has surrendered as the young pitcher continues to harness his control and find a consistent "out" pitch when he gets to a two-strike count.

Corbin, meanwhile, has been one of the most pleasant surprises for Texas far operating out if the 5th slot. He has delivered numbers well below his fairly mediocre career marks and surpassed the expectations of even the most pessimistic Ranger fans.

But he, too, has pitched more like the average starter the team thought they might get when they signed him, allowing 12 hits and 7 earned runs over his last 10 innings pitched and giving up 5 free passes in the process.

Their next starts won't help determine much unfortunately

Leiter's next start is scheduled for Sunday in the Steel City against the light-hitting Pittsburgh Pirates, who are next-to-last in MLB in batting average. It is probably not going to be a helpful gauge of how effective his stuff is. But he can quell a lot of fears by commanding his arsenal better than he has and keeping the walks down.

Similarly, Corbin is set to go again on Monday at Baltimore, where he will face a surprisingly anemic Orioles' offense hitting .24 during what has been one of the league's most disappointing starts to a season.

Corbin needs to get back to what he does well, which is locating his off-speed pitches low in the zone so he can spring his low-90s mph fastball that looks much faster.