Friday provided an example. Lopez, the first man out of the bullpen, inherited a 4-2 lead with one out and a runner on first base in the sixth inning. With the tying run at the plate, Lopez struck out Adam LaRoche and induced Ian Desmond's fielder's-choice grounder.
"I would say the appearances, not just for myself but for everybody in the 'pen, are probably more high-stress than what would be offered in April and May," Lopez said Saturday. "It's because we're playing a 35-game season."
Chris Haft is a reporter for MLB.com. Read his blog, Haft-Baked Ideas, and follow him on Twitter at @sfgiantsbeat. This story was not subject to the approval of Major League Baseball or its clubs.