Houston Astros catcher Brian McCann underwent successful arthroscopic surgery on his right knee, per mlb.com. The team hopes he can return sometime in September, which is longer than the original 4-to-6 week timetable first reported. McCann has battled knee issues on-and-off over the past few seasons, with an occasional disabled stint to manage the pain. McCann has 10 seasons of 20-plus home runs but has really struggled at the plate this season. In 155 at-bats, the veteran backstop is slashin[...]