20.5!!!

Warm-up
General cardio for 3 minutes, then:

3 Rounds
5 Kip Swings
10 Light Wallballs
5-10 Push Ups

Then:
Warm up muscle ups or pull ups.

Crossfit Games Open 20.5 (Ages 16-54) (Time)
For time, partitioned any way:

40 muscle-ups
80-cal. row
120 wall-ball shots, 20/14 lb ball to 10 /9 ft.

Time cap: 20 min.

Crossfit Games Open 20.5 Scaled (Ages 16-54) (Time)
For time, partitioned any way:

40 chin-over-bar pull-ups
80-cal. row
120 wall-ball shots, 14/10 lb ball to 10/ 9 ft.

Time cap: 20 min.

Suggested strategy:
10 pull ups
20 cal row
30 wall balls
4 rounds