Kokkinakis-Harrison handshake and some chatter in Cincinnati

Watch highlights of Serena Williams' fight against her young fellow countrywoman Catherine Mcnally (17 yo) to join third round of this 2019 US Open.

Jack Sock huge forehand return in double at London's ATP Finals.

Juan Martin Del Potro and Vasek Pospisil engage a drop shot duel in Miami.

Huge point, one of the longest rallies of the week, between Rafael Nadal and David Ferrer in London (ATP Finals 2015, Masters).