Olivo is 6-for-13 with a home run against Saunders in his career and his two-run home run Tuesday provided the Mariners' only scoring in that 4-2 loss.
"He's been swinging the bat well and has numbers against this guy, but I wasn't going to catch him," Wedge said. "We don't have a great deal of experience against this guy, but Miggy has the most and has some success against him. Like I said, he's been swinging the bat better."
Olivo's 18 innings was the second-longest catching stint in a single game in Mariners history. Jim Essian caught all 19 1/3 innings in a 4-3 loss to the Angels on April 13-14, 1982, though that game was played over two days.
The previous longest single-day catching performance was 17 innings by Bob Kearney on May 11, 1984, at Yankee Stadium.
Olivo acknowledged he was a little sore after his iron-man duties, but the 34-year-old keeps himself in excellent condition and was happy to be playing again after seeing sporadic time over the past three months with the emergence of John Jaso and rookie Jesus Montero.
"He's done everything we've asked him to do and then some, sometimes under difficult circumstances having Jaso and Montero here," Wedge said. "You know the guy wants to play every single day, but he's been a great teammate all the way and deserves to play today."