Mike Spector advises betting the over of 8.5 runs in the Giants vs Phillies matchup due to anticipated regression from Phillies starter Taijuan Walker. Walker has pitched 10.2 innings without allowing a run this season, with neither of his starts reaching a total greater than seven runs. However, Walker struggled significantly last year, posting a 7.10 ERA across just 83.2 innings and career lows in WHIP (1.721) and strikeouts per nine innings (6.2 K/9). Historically, Walker performs better in the first half of seasons, yet his 7.41 ERA and reduced strikeout rate (4.2 K/9) during spring training signal upcoming struggles. Giants starter Landen Roupp is also due regression, currently benefiting from a low 14.8% hard-hit rate allowed. The Giants have scored five or more runs in nine of their first 15 games, creating a favorable scenario supporting the higher-scoring outcome.