These are two quality starting pitchers, facing two lineups that have had their fair share of troubles — Philadelphia against lefties and San Francisco in general. The Giants have plated four or fewer runs in nine of their 11 games.
Although the surface-level statistics may not show it, these are two quality bullpens. The Phillies have the best SIERA in relief (2.69), but a 4.17 ERA, and the Giants have a quality 3.81 SIERA but a grotesque 4.93 ERA.
Both of those bullpen ERAs are due for positive regression, creating value in the Under in the meantime.
Philadelphia has been anemic against left-handed pitching, posting a measly 59 wRC+ and .165 AVG in 112 at-bats.
Robbie Ray performed admirably at Oracle Park last year (3.50 FIP) and has had plenty of juice in his first two starts (108 Stuff+), so he forecasts for a strong outing.
Facing Christopher Sanchez is never fun, but he’s down one mph on his fastball and has been hittable (10th percentile average exit velocity, 14th percentile hard-hit rate). For as bad as San Francisco has been against RHP, the lineup is close to league-average against southpaws.