His second serve was also the most feared on the circuit, so opponents had little respite even when he missed his first delivery.

One of the biggest pitfalls came late last year, when Facebook announced an advertising program called Beacon that broadcast news of users' online purchases to their friends.

The inadequacy of the interior angle win rate and the low rate in one win. 2. Tennis players in China to directly serve scoring rate and the rate of loss of direct superior opponents.