The difference this year is HUGE. Bet365 always has been ahead of the live scoring ,but literally only by 1-2 seconds. This year it's a good 5-10 seconds.
It's absolutely ridiculous.
Also, betting sites aren't sending their own people for at least SOME matches.
Yesterday, in a WTA match, Jie Zheng vs Monica Niculescu the scoreboard froze in the live scoring with Zheng leading *3-0. The scoreboard also was frozen at bet365 at 3-0. It remained 3-0 on both scoreboards for around roughly 20 minutes. Then the ATP/WTA Live scoring updated their scoreboard to Zheng 6-0 2-1 and it was working again. Seconds later, bet365 then updated their scoreboard and proceeded to put the betting lines up again.
Obviously for that match, they were getting the score directly from the same source as the livescoring, only faster than everyone else.