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One example was a duel between Saburō Sakai, IJN fighter ace with 28 official aerial victories, and Pug Southerland, USN fighter ace with 5 victories. At the time Southerland was not an ace yet, however.
One common formation in fighter combat is the finger four; in this formation the more experienced pilots have offensive roles, and their less experienced wingmen acted defensively. This would help lead to good pilots getting more and more kills. However, in a chaotic dogfight, anything can happen, and wingmen can take on offensive actions too, for example in the Thach Weave. When Sakai shot down Southerland, the kill was shared among 3 Japanese pilots.