As we head into the second full night of coverage, the medal drama is building and one more tennis star drops as Ana Ivanovic withdraws due to a thumb injury. Chicken pox felled a Canadian swimmer and Team USA won an explosive basketball game against China. Tonight, we have swimming finals and gymnastics qualifiers. What you need to know, after the jump. • Phelps watch 2008 continues with tonight's 4x100 free relay. After missing a gold medal four years ago in Athens, the U.S. is determined not to let it happen again. The pressure clearly rests on Phelps' teammates; a loss surely wouldn't be blamed on swimming's wonderboy • Katie Hoff will take another shot at the gold in the 400 meter free. She already has a bronze in these Games. • The women's gymnastics team will compete in qualifiers. Keep an eye out for high flying children . • Diving qualifiers are also tonight. This event just makes me nervous...they always look like they're going to hit the board. And then I realize that hitting the board would be the only thing to make the event worth watching. Thanks for hanging out with me this weekend. You've been lovely.