According to Elias

 

Oswaldo Arcia
Oswaldo Arcia

Oswaldo Arcia hit a three-run home run in the bottom of the fourth inning and singled in Josh Willingham in the bottom of the seventh for his four RBIs in the Twins 6-4 win over the Brewers on Wednesday night. Arcia entered the game hitting just .120 (3-for-25) with men on base this season, which was the fourth lowest such batting average for any major-league player entering Wednesday’s action (minimum: 25 at bats), ahead of only Pedro Florimon (.040), Jose Molina (.054) and J.P. Arencibia (.074).

Joe Mauer
Joe Mauer

To be fair, Arcia only has 60 total at bats in 2014 due to all the time he spent on the DL this year.  Joe Mauer on the other hand has 207 at bats and his batting average with runners in scoring position is .159 this season which means that 240 major league players have a higher batting average with runners in scoring position this season then Joe does. OUCH!