Phil has news: Bopper has an inflamed pancreas and can't race. Mark will be able to compete alongside... Mallory?
34° 23' N 118° 31' W

If you win the first leg of the race you'll win one Express Pass for your team, and one that you must give away to another team before the end of Leg 5.

On this football field is the UCLA Bruins Marching Band. The bandleaders on the sidelines have on their hats the Chinese characters for your first destination, Guangzhou. Find a marching band member on the field itself who also has this on their hat, and bring that band member to Phil. The faster you do it, the more likely you'll get on the first flight to China.
Fly to Guangzhou, China. Once there, travel by taxi or by metro to the Street of Wedding Dresses. Find one of the three shops listed here to receive your next clue, but be careful: each shop only has so many clues to give out. You have an opportunity to conquer your fear of heights for this leg of the race.
First flight
 

   

 Second flight
Some time later

      
34° 23' N 118° 31' W

Gift bag: Travel by metro to find a building with bubbles on top.
   work together to try to find a shop. They go to one of them, but a twinnie declares it's wrong and they turn around.
  split off to work with Caroline & Jennifer.
  find another shop almost right away.
34° 23' N 118° 31' W

Ride the "ferris wheel" to find your next clue. [The doors have clues attached to them. The odd ones say "Try Again"; The even ones have the real clue.]
Search for your next clue at the Stadium on the river below you.
  disagree over whether the big stadium-shaped thing on the river is the stadium on the river.
  Natalie says it doesn't matter which bubble they get into, but they quickly realize that it does. They start arguing over whose fault it is rather than paying any attention as it who looks happy in which bubble, and so they don't know where to go when their first go-round is over. Nadiya gets so gunshy that she talks them out of getting into a correct bubble when they're last.
20° 13' S 70° 09' W

Who's feeling wired?

Perform five aerial flips around a harness, 300 feet up.
     
   
Make your way on foot to your first Pit Stop.
20° 13' S 70° 09' W
   1st place 8:16 am
Express Passes!
7th place 8:57 am (+ 0:41)
2nd place 8:23 am (+ 0:07) 8th place? 9:13 am (+ 0:57)
3rd place? 8:46 am (+ 0:30) 9th place? 9:19 am (+ 1:03)
4th place? 8:39 am (+ 0:23) 10th place? 9:09 am (+ 0:53)
5th place 8:53 am (+ 0:37)
  11th place
Eliminated
6th place 8:56 am (+ 0:40)  
  We see the teams check in at the mat in this order, but they also leave at the listed times, meaning there may have been unaired penalties.