If attacking units are recalled during Combat Cleanup because defending units are still present, does either player win the combat?

Ruling: No. According to Rule 461.3.d, if units are recalled during the Combat Cleanup step, the combat result is "No Result" regardless of which players have units present at the battlefield.

Sequence:

• Combat damage is dealt and lethal damage is processed
• Combat Cleanup occurs: if defending units are present, attacking units are recalled to their controller's base
• Combat result is determined: because a recall occurred during cleanup, the result is "No Result"
• Effects that trigger on winning combat do not trigger because there was no winner