In the constructors' standings, Mercedes remains well out in front with 366 points, ahead of Red Bull on 192 points and McLaren on 106.
With the victory over Ymer, Djokovic improved his record this season to a stellar 32-1. The only defeat came in a disqualification earlier this month at the US Open, where he hit a ball in frustration which struck the line judge on the neck.
Kramaric had another chance on target in the closing stages of the first half but Neuer was on guard and kept his team in the game with a diving save.
Another game on Monday saw Tianjin take a 3-0 (25-17, 25-17, 25-17) victory over Fujian.
Although Betis had over 70 percent of the possession in the first half, they were 3-0 down at the break after Angel Rodriguez scored twice and Marc Curcurella netted Getafe's other goal.
Barbosa was forced off with an ankle injury at half-time, and his replacement Henrique took his chance by netting twice in the space of 20 minutes.
Tianjin rode an early 8-0 spurt to race ahead, and compiled a 25-19 advantage as the first quarter ran out.
The former world No. 1 is set to face a tougher challenge in the second round against 2017 champion Jelena Ostapenko of Latvia, who knocked out American Madison Brengle 6-2, 6-1.
The next stage will begin with a two-legged knockout round from October 16. Enditem
Elsewhere, last season's fourth-placed side Lazio enjoyed a 2-0 away win over Cagliari with goals from Manuel Lazzari and Ciro Immobile.
QINGDAO, China, Oct. 1 (Xinhua) -- Yan Zibei from Hubei won the men's 200m breaststroke in two minutes 12.14 seconds at the Chinese national swimming championships here on Thursday.