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I agree with what you said as well. Actually my impression was that Yu Ziyang's cry was very loud indeed but actually it made it seem more so that innately he was afraid but was putting on a mask to hide this. I think everyone is different, some cry louder, some much less. If you compare only the top chinese players, I would argue Zhang Jike>Ma Long or Xu Xin in showing his confidence (whether in his cries or the fact he takes off his shirt after winning the world championships). Some people see it as disrespectful, others see it as the confidence of the champion, it's very narrow indeed the fine line between showing confidence (or at least pretending confidence) and seeming arrogant. Thats why everyone likes different players (besides differences in technical style). Yu Ziyang I think is basically following alot of the other chinese players, we will see what he seems like in the future. By the way, I heard a few things he said after winning the match (it was recorded on camera in chinese) and he seemed pretty normal to me, he didn't seem cocky to me at all, more like an excited teenager, as he should be after winning a Tour against a top player
By the way, I just saw the semi-final replay between Mizutani and Muramatso (apologies if misspelt) and I have to sympathise that Mizutani must have been drained of energy after that testing duel. I think Mizutani played below par, probably because of the toughness of semi-final and also a bit nervous in front of expectant home crowd in the finals when he was clear favourite. In fact crowd was really quiet after Mizutani lost, I feel very sorry for him, I have similar experiences before in chess, it feels terrible to disappoint your own country in front of home crowd, the feeling is doubly hurtful. Better luck for him next time!
Indeed shouting boosts confidence. Talking about Zhang Jike, you reminded me the "ChOOO" he made against Wang Hao at the 2013 WTTC Final after taking the 4th set 14-12 (after being down 7-10 and won a spectacular BH-BH rally to make it 13-12). ZJK did not make that CHO towards Wang Hao; Yu Ziyang CHO-ed against Tang Peng as they were both going to their respective towels.. Can you imagine that; they were heading towards each other and Yu Ziyang just cho-ed as loud as he can... I do not know if he was arrogant; but what I observed was that he intended of or thought about doing it; there was like a second or two delay between winning the set and the CHO. Regarding the confidence of the champion, I am sure many of us here still doubt the validity of Yu Ziyang being the champion. Of course, the way we view a player's attitude is very subjective. But another opinion, if he was really following the top chinese players, I am quite sure ML XX ZJK WH won't be proud of this.
Btw, I haven't watch Mizutani vs Muramatsu; I am sure though Mizutani was drained.
Out of this line of topic, I was really annoyed that Mizutani's coach won't stand up to the umpire to argue with him. Remember at the last 2014 WTTTC, Li Ching was already shouting to the umpire (HKG vs JPN; home crowd was so loud in cheering) to fight for the team himself. [well that was really a dispute; do not want to explain further to go totally out of topic) HKG was down 8-10; the player fought it back to 10-10. Credits to the coach.
Another one was at the 2012 Olympics: Jiang Tianyi vs Kim Hyok Bong. Jiang was faulted at 6-6 because of time-wasting. Chan Kon Wah stood up and even went beside the umpire. Jiang trailed 6-7 and lost two points to make it 6-9. But I am sure Jiang knew his coach wanted him to win (shown by the coach fighting for him, under the risk of another red card). He fought back from 7-10 to make it 10-10. Jiang won 15-13. Credits to the coach. So the coach is not just there for nothing. I really do not know why Mizutani's coach was just watching (maybe just mumbling).... Sorry if my examples digressed too much; I just wanted to point out the importance of the coach.