Three-time major winner Sabalenka is chasing a maiden Wimbledon title, having missed last year's Championships because of a shoulder injury.
The match was briefly halted after Raducanu spoke with the umpire, who quickly contacted tournament organisers. The 22-year-old stood behind the official's chair as the spectator was escorted away.
The pair were granted a wild card after Murray pulled out of the singles due to his failure to regain full fitness.
Three-time major winner Sabalenka is chasing a maiden Wimbledon title, having missed last year's Championships because of a shoulder injury.
The match was briefly halted after Raducanu spoke with the umpire, who quickly contacted tournament organisers. The 22-year-old stood behind the official's chair as the spectator was escorted away.
The pair were granted a wild card after Murray pulled out of the singles due to his failure to regain full fitness.
