British duo Dan Evans and Kyle Edmund were both beaten at the quarter-final stage of different warm-up events for the Australian Open.
Evans got to the last eight of the Adelaide International before losing 6-4 3-6 6-3 to Russian Andrey Rublev.
Edmund suffered a 7-6 (7-5) 7-6 (7-5) defeat by American John Isner at the Auckland Classic in New Zealand.
Isner's serve was key as he sent down 25 aces during the match and had a first serve percentage of 75%.
The Australian Open - the first Grand Slam of the year - takes place between 20 January and 2 February.