The Giants placed Walker on the paternity list Saturday, Evan Webeck of The San Jose Mercury News reports.

EDGE Analysis

Walker will be allowed to miss up to three games as he spends time with his expanding family. Casey Schmitt was brought up in a corresponding move to bolster the Giants' infield depth.

Walker will serve as the Giants' opener for Wednesday's game against the Rays, Susan Slusser of the San Francisco Chronicle reports.

EDGE Analysis

Walker turned in a good performance during his last time out as San Francisco's opener Monday, throwing two scoreless innings and striking out four batters. The 27-year-old righty has been extremely effective with a 2.28 ERA through 43.1 innings this season, but he'll likely only remain in the game for the first two or three frames.

Walker struck out four over two scoreless frames while serving as the Giants' opening pitcher in Monday's 10-2 loss to the Rays. He worked around two hits and one walk in the 39-pitch outing.

EDGE Analysis

Walker did his part to the keep the Rays offense at bay, but primary pitcher Tristan Beck (five runs allowed over three innings) was unable to continue the trend once he took over in the top of the third. Expect manager Gabe Kapler to continue making frequent use of Walker as an opener while the Giants have only two locked-in traditional starters at the moment in Logan Webb and Alex Cobb. In nine outings as an opener this season, Walker has produced a 2.40 ERA, 1.47 WHIP and 25.0 K-BB% in 15 innings.

Walker will serve as the opener for Monday's game against the Rays, Susan Slusser of the San Francisco Chronicle reports.

EDGE Analysis

Walker has been effective since the All-Star break, posting a 1.47 ERA and 0.76 WHIP in 18.1 innings over 12 appearances since mid-July. He's made eight starts this season but hasn't pitched more than three innings in any of his appearances, and he'll have another opportunity to serve as an opener Monday.

Walker will serve as the Giants' opener Wednesday against the Angels, Susan Slusser of the San Francisco Chronicle reports.

EDGE Analysis

Walker will be making his eighth start of the season Wednesday. While he hasn't pitched more than three innings in any of his appearances this year, Walker has been effective on the mound with a 2.52 ERA, 1.19 WHIP and 41:11 K:BB through 39.1 frames.

Walker (4-1) allowed a run on a hit and a walk in one-third of an inning to take the loss Saturday versus the Athletics.

EDGE Analysis

Walker put two of the three batters he faced on base, and Scott Alexander allowed one of them to score the decisive run. This was Walker's first loss of the year, made all the more impressive considering he's made seven of his 27 appearances as an opener. He's now at a 2.56 ERA, 1.19 WHIP and 41:10 K:BB through 38.2 innings while most often serving in a low-leverage role.

Walker (4-0) allowed two hits over 2.1 scoreless innings to earn the win Tuesday over the Diamondbacks. He did not strike out or walk a batter.

EDGE Analysis

After three straight bullpen games, including one in which Walker was the opener (Saturday), he was able to spare his fellow relievers with a strong outing. He's given up just two runs over his last 15.1 innings while posting a 14:1 K:BB in that span. Walker is at a 2.35 ERA, 1.15 WHIP and 41:9 K:BB through 38.1 innings over 26 appearances (seven starts) this season. He'll likely continue to be an option to open bullpen games going forward, which drastically limits his ability to collect wins.

Walker will open Saturday's game against the Red Sox, Alex Pavlovic of NBC Sports Bay Area reports.

EDGE Analysis

This will be Walker's second turn as an opener this week and seventh this season. He's pitched to an impressive 2.70 ERA so far this season, but Walker will likely go no more than three innings before turning things over to Anthony DeSclafani.

Walker will serve as the Giants' opening pitcher in Wednesday's game versus the Athletics, Danny Emerman of KNBR 680 San Francisco reports.

EDGE Analysis

It's Alex Wood's turn in the rotation, but the lefty looks set to serve as a bulk reliever. Walker will be working as an opener for the sixth time this season after allowing four earned runs in 6.2 innings across the previous five outings.

Walker (3-0) pitched a perfect inning and struck out one to earn the extra-inning win Sunday over the Pirates.

EDGE Analysis

Walker kept the game tied in the ninth inning and the Giants rallied ahead in the 10th to give him the win. The right-hander has frequently served as an opener with the Giants using a lot of bullpen games in recent weeks, but he has a better chance of collecting decisions when working as a traditional reliever. He's at a 3.00 ERA, 1.46 WHIP, 28:8 K:BB and one blown save through 24 innings in a mostly low-leverage role.