After having been told about the first stringers by Sanada, some of the elite black coats begin matches with players 11–20 from the first string. Yanagi faces off against No. 17 Mitsuya. To Inui's surprise he calls Mitsuya "Akuto-niisan." Mitsuya is the man who taught Yanagi Data Tennis before, Though it's a battle between two powerful Data Tennis players, Inui senses something is off when he sees Mitsuya toying with Yanagi. Meanwhile, Momoshiro and Kenya battle No. 18 Hira and No. 19 Hara Shitenhoji OB doubles team and struggle against their opponents' unique rhythm. While these battles take place, the remaining court 1 members inform the court 3 middle school winners about the first string and announce that court numbers no longer matter.