What happened: Phillies left-hander Cristopher Sanchez was untouchable in May, posting a 0.00 ERA across 5 starts and 39 innings, including one complete-game shutout. He allowed 25 hits and 3 walks while striking out 45, holding hitters to a .181 average and a 0.72 WHIP. Per the source, the run set a new Phillies

Why it matters: The month dropped Sanchez's season ERA from 2.90 to 1.48, vaulting him into the front of a Phillies rotation built around young arms. A franchise scoreless-innings record signals a genuine ace emergence, which reshapes how Philadelphia is valued in division and playoff-odds markets. Sustained dominance from a top starter is the kind of trend that moves team win totals and series pricing.

What to watch: Watch whether Sanchez extends the scoreless streak into his next start and whether the Phillies lean on him as a Game 1 type arm. Any uptick in workload or velocity dip would be the first sign the run is cooling.