I'm glad so many people here rate season 2 so highly - none of my social circle who watch it thought it was that great. But it had the Bay Harbour Butcher, Lila, Deb and Lundy, lots of Doakes, and was exciting throughout.
My list would go 2>1>4>5>6>3
Svetlana Kuznetsova|Duan Ying-Ying|Francesca Schiavone|Zhang Shuai|Sloane Stephens|Ashleigh Barty
Andy Murray|Stanislas Wawrinka|Dominic Thiem|Juan Martin Del Potro|Thanasi Kokkinakis