Nadal angrily threw down a ball and remonstrated with the umpire after Hawkeye overruled the line judge's decision in the first-set breaker.

BBC: SPORT | Tennis | Nadal loses to Youzhny in Dubai

The circuit-breaker restrictions apply to that stock on the next day of trading as well, and short sales would stand in line behind sell orders from other traders.

FORBES: SEC's New Circuit Breaker Falls Short Of Uptick Rule