I'm going to add something new this time. Through yesterday the U18/19 teams have played 676 games. Here are the 5 biggest upsets of the season (based on RPI differential):
1. Portland Thorns FC 2-0 victory over Real So Cal on 2/23/19
winner RPI (RPI rank, standing): 0.4715 (37, #3 NW)
loser RPI (RPI rank, standing): 0.6014 (2, #1 SW)
RPI differential (RPI rank differential): 0.1299 (35)
2. San Jose Earthquakes 3-2 victory over Crossfire Premier on 10/27/18
winner RPI (RPI rank, standing): 0.4118 (56, #8 NW)
loser RPI (RPI rank, standing): 0.5372 (18, #1 NW)
RPI differential (RPI rank differential): 0.1254 (38)
3. So Cal Blues Soccer Club 1-0 victory over Los Angeles Premier Futbol Club on 4/14/19
winner RPI (RPI rank, standing): 0.4354 (49, #13 SW)
loser RPI (RPI rank, standing): 0.5595 (14, #5 SW)
RPI differential (RPI rank differential): 0.1241 (35)
4. Oklahoma Energy FC 4-3 victory over Frontier..SPORTING Blue Valley on 11/11/18
winner RPI (RPI rank, standing): 0.4008 (57, #9 Frontier)
loser RPI (RPI rank, standing): 0.5108 (25, #4 Frontier)
RPI differential: 0.1100 (32)
5. Lamorinda Soccer Club. 2-1 victory over Crossfire Premier on 10/14/18
winner RPI (RPI rank, standing): 0.4418 (47, #7 NW)
loser RPI (RPI rank, standing): 0.5372 (18, #1 NW)
RPI differential: 0.0954 (29)
The first 3 are all massive upsets, though the first two might be explained by the losing teams each missing their leading scorers for those games. Also, Real So Cal's RPI is so high, any loss would be a major upset.
In the #3 upset, all of LA Premier's leading scorers played, including their superstar Brianna McReynolds (the fifth leading scorer in the country). They had only been shut out once before all season so hard to explain that one.
If I have time I'll try to do a similar analysis for the other age groups, but it may be a week or so.