Ironically, I ended up with a break in both at the same time, as the Tennis Channel coverage ended at 8:30 my time just as the cricket went for lunch, and the ESPN2 continuing coverage of tennis is being delayed by a basketball game. Hm, maybe that will give me time to have dinner.
Addendum: And a new episode of MythBusters. Ack! And you can't take your eye off the cricket, as the Australians tried to melt down, dropping two more wickets quickly after lunch.