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The only move in the top 20 saw Spain's Roberto Bautista swap 16th and 17th places with American Jack Sock.
Rafael Nadal retains the world number one spot but has a lot of points to defend before the French Open starts next month, starting with this week in Monte Carlo.
Last year he won titles in Monte Carlo, Barcelona and Madrid and a failure to record a clean sweep again this year could give number two Roger Federer the chance to reclaim top spot.
ATP rankings as of April 16:
- Rafael Nadal (ESP) 8,770 pts
- Roger Federer (SUI) 8,670
- Marin Cilic (CRO) 4,985
- Alexander Zverev (GER) 4,925
- Grigor Dimitrov (BUL) 4,635
- Juan Martín Del Potro (ARG) 4,470
- Dominic Thiem (AUT) 3,665
- Kevin Anderson (RSA) 3,390
- John Isner (USA) 3,125
- David Goffin (BEL) 3,110
- Lucas Pouille (FRA) 2,410
- Pablo Carreño (ESP) 2,395
- Novak Djokovic (SRB) 2,310
- Sam Querrey (USA) 2,220
- Diego Schwartzman (ARG) 2,220
- Roberto Bautista (ESP) 2,175 (+1)
- Jack Sock (USA) 2,155 (-1)
- Tomás Berdych (CZE) 2,140
- Hyeon Chung (KOR) 1,897
- Fabio Fognini (ITA) 1,840
Selected others:
- Kyle Edmond (GBR) 1,757 (+3)