Tuesday will be the fourth day of action from the London 2012 Games. As usual, for the swimmers, heats will take place in the morning.
The U.S. swimming team will have Nathan Adrian and Cullen Jones representing in the Men's 100m Freestyle.
Cammile Adams and Kathleen Hersey will participate in the Women's 200m Butterfly. Clark Burckle and Scott Weltz will take part in the 200m Breaststrokes.
The last heats taking place tomorrow are the Men's 4x200m Free Relay, also known as the 800m Free Relay.
The all-star cast of Michael Phelps, Ryan Lochte, Rickey Berens and Conor Dwyer will participate in the 6 a.m. ET heats.
Later in the day, beginning just before 2:40 p.m. the Women's 200m Freestyle Finals will take place. Allison Schmitt and the sensational Missy Franklin, who barely qualified for the Finals, will represent the U.S. in the event.
Michael Phelps will have another chance to win gold as the Men's 200m Butterfly will be taking place tomorrow. Alongside Phelps is American Tyler Clary.
Right before the 4x200m Free Relay Final takes place, the Women's 200m Individual Medley will take place. The U.S. will have Caitlin Leverenz and Ariana Kukors taking the block.
Here is the layout of the the schedule.
July 31st, Day 4
| Event | Time (ET/GMT) |
| Men's 4x200m Freestyle Relay | Heats: 6:02 a.m./11:02 a.m. |
| Finals: 3:47 p.m./8:47 p.m. | |
| Women's 200m Freestyle | Finals: 2:39 p.m./7:39 p.m. |
| Men's 200m Butterfly | Finals: 2:47 p.m./7:47 p.m. |
| Women's 200m Individual Medley | Finals: 3:39 p.m./8:39 p.m. |
| Men's 100m Freestyle | Heats: 5 a.m./10 a.m. |
| Semifinals: 2:30 p.m./7:30 p.m. | |
| Women's 200m Butterfly | Heats: 5:23 a.m./10:23 a.m. |
| Semifinals: 2:55 p.m./7:55 p.m. | |
| Men's 200m Breaststroke | Heats: 5:40 a.m./10:40 a.m. |
| Semifinals: 3:17 p.m./8:17 p.m. |