Many wondered, especially after his shock Australian Open quarter-final loss last year to Stan Wawrinka, just what Boris Becker brought to the table for Novak Djokovic.
Now Becker's influence is there for all to see as Djokovic eyes revenge tonight in the third instalment of his compelling Melbourne Park rivalry with Wawrinka.
Djokovic's epic five-set loss to the Swiss 12 months ago not only ended the Serb's three-year reign in Melbourne but also his remarkable run of 14 successive Grand Slam semifinal appearances.
It also came just weeks after Djokovic appointed Becker as coach, a move that raised eyebrows in tennis circles despite it continuing the growing trend of today's stars turning to yesterday's heroes to gain a Grand Slam edge.
Now, though, tennis' odd couple are flying, Djokovic passing Becker on the all-time major leaderboard with his second Wimbledon crown last year and returning to world No 1 with the German great in his corner.