So not exactly Batman or Nightwing fast, perhaps a tad lower....
And Scott apparently now has a visor that's thought-activated, so he literally only has to think, 'fire.'
Scott himself would be below Canary in speed, but given his overall feats and combat training, he should be near-enough that just thinking 'fire' gets him some wins here.
If I were actually in the stadium, if the event program stated that Scott had his Shi'ar visor, I would bet on him to win the majority.
There's also the possibility of a mutual kill. Canary could get off a sonic cry (speed of sound), and then Scott's beam fires before the cry hits, and they both get knocked out or killed.