Troy Isley joined fellow U.S. pros Keyshawn Davis and Duke Ragan in the winners circle.

The 22-year-old advanced to the Round of 16 after edging Belarus' Vitali Bandarenka in their opening round middleweight bout Monday afternoon at Kokugikan Arena in Tokyo. Isley prevailed by scores of 30-27 on all five cards to become the fifth American boxer to advance in the Tokyo Olympics. 

Isley made history along with Davis and Ragan in becoming the first pro boxers to represent the U.S. in the Olympics. All three were granted late slots on the team due to their placement in the Boxing Task Force Rankings, with Ragan and Davis winning their opening round bouts on Day 1 and Day 2, respectively.

On Monday, it was Isley's turn to make some noise. The Top Rank-promoted middleweight—who is 2-0 (1KO) as a pro—had a favorable draw in Bandarenka, who is experienced on the world stage though lacking much success. The pattern held true for the Belarusian, who was always a step behind in an active opening round for Isley who was sharp with his counterpunching and defensive prowess. 

Isley worked the body to start round two. The 22-year-old shot off rapid fire combinations before reverting to counterpunching mode. Bandarenka tried to close the gap but Isley never remained in place long enough to allow the 35-year-old to plant his feet and impose his will.

Action slowed in the final round, by which point Isley enjoyed a commanding 20-18 lead on all five cards. Isley mainly played keepaway, forcing Bandarenka to follow him around the ring and often making him miss. Isley landed a final combination in the final minute to seal the victory. 

Davis, Ragan, Delante Johnson and Ginny Fuchs have also enjoyed opening round wins. The U.S. team has now won five straight bouts following a split decision loss suffered by featherweight Yarisel Ramirez on Day 1 of competition. 

Isley has a tough task ahead in the Round of 16. He next faces ROC's Gleb Bakshi, the reigning World Amateur champion and the number-two seed. Their bout takes place Thursday afternoon in this very venue. 

Jake Donovan is a senior writer for BoxingScene.com. Twitter: @JakeNDaBox