It should come as no surprise, but the Phillies are the one team in baseball with a rotation ERA under 3.00 halfway through the season. Here’s how the starter ERAs rank, 1-30. 1. Phillies – 2.97 2. Athletics – 3.11 3. Mariners – 3.19 4. Braves – 3.30 5. Giants – 3.35 6. Angels –…