"I thought it was the perfect night to give him a little more comfort,'' Maddon said.
Maddon noted that putting Myers at first later in the games is an option he might use more in the future. His first stint came during the 14-inning, 10-5 win over the Yankees in New York on May 2.
"Wil may do that during the course of the season in different moments like you saw in the five-man infield," Maddon said. "You might see if we do a lot of crazy stuff, pinch-run say for Loney late in the game and here's the 10th or 11th inning."
During his first stint at first, Myers used the outfield glove he uses while playing right field and had a putout. Monday night he used first-base coach George Hendrick's first baseman's mitt and made one play, fielding a grounder by Seattle's Brad Miller then touching first base for the unassisted out.
Myers, who played first base in high school and third in the Minor Leagues, said he's fine with having some action at first.
"I don't mind moving around, playing wherever," Myers said. "Just to change it up a little bit is nice."
Bill Chastain is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.