Andy Murray says friendship will be put to one side on Friday against fellow Brit Kyle Edmund in the China Open quarter-finals.
Murray, who is hoping to make up some ground on world number one Novak Djokovic in the standings this week, booked his spot in the last eight with a comfortable straight-sets win over Russia's Andrey Kuznetsov.
The reigning Olympic champion did drop serve a couple of times but still had more than enough quality to see off his opponent, recording a 6-2 6-1 victory in one hour and 16 minutes.
Murray remains on course to reach the final in Beijing for the first time but it will no easy task in the quarters, with Davis Cup team-mate Edmund waiting.
The 21-year-old, who was born in South Africa, caused a huge tournament upset by dispatching Spanish world number 18 Roberto Bautista Agut 6-4 4-6 6-4.
It was one of Edmund's best ever results in an ATP Tour event although an improvement will be required in order to advance to the last-four stage.
Murray says it is always a strange feeling when going up against a team-mates but insists he will be fully focused on picking up the win.
"(On) the day of the match, it's always a little bit uncomfortable," he said. "Normally when you see your friends and stuff in the locker room, you have a chat, joke around a bit. But on match days it always tends to be a little bit more serious."
Murray won his only previous meeting with Edmund, at Queen's Club earlier this year, recording a 6-4 3-6 6-1 victory in the quarter-finals of the grass-court event.