Jason Vargas, the Mariners’ starting pitcher tonight against the Yankees, is approaching untested territory in the number of innings he has pitched and the M’s are monitoring him because of it. Vargas, who’ll make his 17th start, has pitched 100 2/3 innings this season. His career high is 143 1/3 in 2009 when he split the season between the Mariners and Class AAA Tacoma.