After a knee injury the past boxing champion has returned (回) to the ring to meet his rival once again first round of the day. This time with vengence for the wilful injury the other inflicted on him. The champ wishes to close (合) the past and start a new chapter in his career.
round (boxing etc), rally (tennis etc), frame (billiards etc), inning, (tennis, soccer etc) rubber or leg, and round (of negotiations)
The new fans who (hu) ain't (í) familiar with the history of the boxers heard (hé) quickly by the 2nd round from others and now cheer for the old champ.
hui2 he2 and hui he