Gukesh never got a chance against Mamedov who is known as a theoretician.
Rohan Bopanna and Uruguay's Pablo Cuevas lost to Raemon Sluiter and Peter Wessels in the final of the Siemens Open on Sunday.
Prakash Amritraj entered the main draw of the US $416,000 Hall of Fame Tennis Championships at Newport, Rhode Island.
The Rest of the World maintained a four-point lead over the Armenians with a 3-3 draw in the fourth match of the Tigran Petrosian event.
Viswanathan Anand led the Rest of the World team to a scintillating 3.5-2.5 victory against Petrosian team on the opening day of the Petrosian Memorial match.
A look at some daredevil acts in recent years