Here are the most advanced main battle tanks currently in service.
Leopard 2A7+ (Germany)
K2 Black Panther (South Korea)
M1A2 SEP Abrams (United States of America)
Challenger 2 (United Kingdom)
Merkava Mark 4 (Israel)
Type 10 (Japan)
Leclerc (France)
Oplot-M (Ukraine)
T-90 MS (Russia)
Type 99 (China)