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
Jarmila Wolfe|Svetlana Kuznetsova|Francesca Schiavone|Zhang Shuai|Sloane Stephens|Ashleigh Barty
Andy Murray|Stanislas Wawrinka|Ryan Harrison|Juan Martin Del Potro|Jack Sock