On the 6th, Nippon-Ham pitcher (33) welcomed the addition of pitcher Kohei Arihara (33), who is in the same grade as him and has been his rival since high school. On that day, he opened up his training to the public at the team's second-division facility in Kamagaya, Chiba. He showed his willingness to learn from his strong rival who is competing for a starting position, and set high goals for himself in both pitching and batting.

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Yamazaki and Arihara in their amateur days faced each other in the 2010 Senbatsu semifinals when they were both in their third year of high school. Yamazaki, who was the ace of Nichidaisan, started and left the mound with 2 runs in the 4th inning, but as the 5th hitter, he exploded with 4 At Bat 4 hit 2 RBI, contributing to the attack on Guangling's ace Arihara. Nichidaizo, who showed an onslaught of 10 runs in the 8th inning, came from behind to win, and Arihara made it 12 runs in the middle of the 8th inning to losing pitcher. In the league matches between Tokyo Six Universities, the two sides have faced each other four times as starters. Yamazaki had 1 win and Arihara had 3 wins. In the spring of 14, which was 4 years, both started in the 3rd game with 1 win and 1 loss. Waseda University and Arihara were winning pitcher in the 5th inning with 2 runs, and Meiji University and Yamazaki were losing pitcher in the 3rd inning with 3 runs.