The only time Sentry had the upperhand on Blue Marvel was with blindside attacks when Marvel was busy pwning the Avengers. Sentry pummeled him to the ground with a blindside attack... one windup shot and Sentry was unconscious in space. He woke up, and hit Marvel with another blindside shot when he had gone back to pwning the Mighty Avengers. It was a KO, but it was HARDLY a win for the Sentry.