This one slipped past me but it turns out that former Minnesota Twins second baseman Alexi Casilla, now playing in the Baltimore Orioles organization with the Triple-A Norfolk Tides, was asked to pitch in the eighth and ninth innings of Sunday's contest against the Charlotte Knights.
Casilla apparently pitched a clean frame in the eighth but was wild in his second inning of work and ultimately lost the game:
The Tides ran out of available pitchers, so second baseman Alexi Casilla took the mound in the eighth inning. He threw a scoreless eighth, but wasn't as fortunate in the ninth. He allowed a single, threw two wild pitches and walked two batters - one intentional. That loaded the bases for Mitchell, who ended it with a single.
Here is a video clip of Casilla delivering the walk-off hit to Charlotte's Michael Taylor: