1) Ronald Koeman (Southampton)
In first place based on recent work, Ronald Koeman arguably won the transfer window last summer. The incoming Southampton manager coped with amazing pressure from losing star players Adam Lallana, Luke Shaw, Rickie Lambert, Calum Chambers and Dejan Lovren to rebuild a squad that arguably looked better than before. Discovering talents like Graziano Pelle and Dusan Tadic on the cheap, as well as giving Ryan Bertrand a chance to shine, the Dutchman is the ultimate moneyball manager, doing the best he can with limited funds and with big clubs ready to poach his best players at the first chance.