Lopez announced he will retire from baseball on Wednesday, Ken Rosenthal of Fox Sports reports.

EDGE Analysis

The 39-year-old spent his 14 years in the league on five different teams, winning four World Series championship rings over the course of his career with the Red Sox and Giants. He posted a career ERA of 3.48 over 533.1 career innings.

Lopez could be situational save opportunities against lefty-heavy lineups. He entered Friday's game in a save situation, walking the only batter he faced before being lifted in the eventual win over Arizona.

EDGE Analysis

Manager Bruce Bochy state that he would be using a closer by committee approach with Santiago Casilla officially out as closer in San Francisco. Lopez is the least likely to see save opportunities given his profile as a left-handed specialist, but he could occassionally run into a save or two when the opposition has multiple lefties due up in the inning.

Lopez retired the only two batters he faced Monday, striking one out in the process.

EDGE Analysis

Lopez hasn't been as effective as he has in year's past (4.15 ERA), but he has strung together five consecutive scoreless innings over his last eight appearances. Given the nature of his LOOGY (lefty one-out guy) role, he provides little to no fantasy appeal.

Lopez opened the ninth inning and retired the only batter he faced to earn his seventh hold of the season Friday.

EDGE Analysis

At age 38, Lopez is at the tail end of his career, as evidenced by his 4.63 ERA despite mainly facing left-handed batters. Manager Bruce Bochy still uses him as a LOOGY in late-inning situations, so he will get the occasional hold like he did Friday. Other than that, he doesn't hold much fantasy value.

Lopez struck out the single batter he faced in Saturday's victory over the Cubs.

EDGE Analysis

After a rough outing against the Dodgers in April where he was taken for two runs, Lopez has seemingly returned to his old form. In the Month of May, he has yet to give up a hit and has only allowed one walk. As usual, his appearances have been one inning or less, for his primary value is his ability to shut down left-handed batters. The one surprise in Lopez's performance this season has been his effectiveness against right-handed batters. Traditionally, Lopez has an opponent batting average over .200 against righties, but they are 0-for-11 against the southpaw this season.

Lopez was brought in to face one batter and recorded a strikeout in Tuesday's loss to the Diamondbacks.

EDGE Analysis

The left-handed specialist came in retired John Lamb on three pitches. Lopez will primarily be used in this role throughout the season. His ERA sits at 10.80, but the majority of the damage done to him this year has been when he has been asked to face more than one or two batters.

Lopez has appeared in just four Cactus League games so far, posting a 4.50 ERA with two strikeouts.

EDGE Analysis

San Francisco already knows what they have in Lopez, so there is no need to overwork him during spring training. Despite the retirement of left-handed setup man, Jeremy Affeldt, Lopez will likely serve the same left-handed specialist role he has for the Giants since joining the club in 2010. Even though he posted a sparkling 1.60 ERA in 2015, he simply doesn't log enough innings (39.1 IP in 2015) to be a valuable ratio enhancer in standard leagues.

Lopez could be a candidate to close games while Santiago Casilla (fatigue) is rested, Andrew Baggarly of CSN Bay Area reports. Lopez will likely close games if the opposition has several lefties lined up in the ninth inning, while Sergio Romo would get the call with right-handers scheduled to bat. Lopez has much better numbers on the season, however, posting a 1.59 ERA and 0.75 WHIP. Although Lopez should continue to be a relatively reliable source for holds, this boost in value will likely be temporary.

Lopez retired all four batters he faced Thursday, striking out two in the loss to the Reds. Lopez has a sparkling 1.93 ERA and 0.54 WHIP on the season. Thursday's 1.1 inning appearance was a rare one, as manager Bruce Bochy usually uses Lopez for just one or two batters per outing. His lack of innings logged is what keeps him from being middle reliever to target.

Lopez (biceps) made his spring training debut Tuesday, recording two outs while walking one and allowing one hit against the Padres. Lopez has been dealing with biceps tendinitis this spring, but he made his debut and felt fine after the outing. At the age of 37, the Giants will probably focus on getting him rest during spring training. Lopez will resume his role as a left-handed specialist once the season gets under way.