Kevin/Marcus entered their 8th SS/SSP final this year (5 Gold, 2 Silver) wow.. Remind me the domination of WXL/YY in WD few years ago
If it an obvious out, an umpire can overule the line judge but if it is too close, he will has to take the line judge call. I think the umpire was saying no hawkeye for service line and hence they cannot challenge.
I'm always surprised at the amount of unprofessionalism at the highest level... I don't know how it is in Tennis, but I don't think it's a bad as this.
And people will praise them again. These unmanned players should get some manner lesson. This is worst than any MD pair. I never see Lee/Yoo, Cai/Fu, Jung/Lee, Ahsan/Hendra, Hendra/Kido do this.
Wether you great or not in any sports dicipline, one thing you should keep it high, RESPECT your opponent. Thats call Sportif.
What you mentioned have always been a traditional kind of mind tactic strategy against opponent in many sports.