I have been tracking referee performance in the Group games of the 2018 FIFA World Cup.
I am using the data shared on the official website to monitor: total game time and ball in play time.
My rank order for the 48 games by ball in play time is:
| Game ID |
Referee | Country | Game | Playing Time |
| 2 | Bjorn Kuipers | Netherlands | Egypt v Uruguay | 64 |
| 25 | Bjorn Kuipers | Netherlands | Brazil v Costa Rica | 64 |
| 41 | Alireza Faghani | Iran | Serbia v Brazil | 64 |
| 6 | Szymon Marciniak | Poland | Argentina v Iceland | 62 |
| 9 | Cesar Ramos | Mexico | Brazil v Switzerland | 62 |
| 43 | Mark Geiger | USA | Korea v Germany | 62 |
| 22 | Mateu Lahoz | Spain | Denmark v Australia | 61 |
| 34 | Wilmar Roldan | Columbia | Saudi Arabia v Egypt | 61 |
| 37 | Sando Ricci | Brazil | Denmark v France | 61 |
| 18 | Clement Turpin | France | Uruguay v Saudi Arabia | 60 |
| 27 | Szymon Marciniak | Poland | Germany v Sweden | 60 |
| 45 | Damir Skomina | Slovenia | Engalnd v Belgium | 60 |
| 16 | Damir Skomina | Slovenia | Colombia v Japan | 59 |
| 42 | Clement Turpin | France | Switzerland v Costa Rica | 59 |
| 47 | Janny Sikazwe | Zambia | Japan v Poland | 59 |
| 4 | Gianluca Rocchi | Italy | Portugal v Spain | 58 |
| 5 | Andres Cunha | Uruguay | France v Ausralia | 58 |
| 10 | Malang Diedhiou | Senegal | Costa Rica v Serbia | 58 |
| 1 | Nestor Pitana | Argentina | Russia v Saudi Arabia | 57 |
| 21 | Mohammed Abdulla | UAE | France v Peru | 57 |
| 31 | Cesar Ramos | Mexico | Poland v Colombia | 57 |
| 36 | Ravshan Irmatov | Uzbekistan | Spain v Morocco | 57 |
| 8 | Sando Ricci | Brazil | Croatia v Nigeria | 56 |
| 11 | Alireza Faghani | Iran | Germany v Mexico | 56 |
| 26 | Felix Brych | Germany | Serbia v Switzerland | 56 |
| 29 | Jair Marrufo | USA | Belgium v Tunisia | 56 |
| 38 | Sergei Karasev | Russia | Australia v Peru | 56 |
| 13 | Janny Sikazwe | Zambia | Belgium v Panama | 55 |
| 15 | Nawaf Shukralla | Bahrain | Poland v Senegal | 55 |
| 30 | Ghead Grisha | Egypt | England v Panama | 54 |
| 46 | Nawaf Shukralla | Bahrain | Panama v Tunisia | 54 |
| 7 | Bakary Gassama | Gambia | Peru v Denmark | 53 |
| 12 | Joel Aguilar | Salvador | Sweden v Korea | 53 |
| 17 | Enrique Caceres | Paraguay | Russia v Egypt | 53 |
| 19 | Mark Geiger | USA | Portugal v Morocco | 53 |
| 20 | Andres Cunha | Uruguay | Iran v Spain | 53 |
| 24 | Matthew Conger | New Zealand | Nigeria v Iceland | 53 |
| 23 | Ravshan Irmatov | Uzbekistan | Argentina v Croatia | 52 |
| 28 | Milorad Mazic | Serbia | Korea v Mexico | 52 |
| 39 | Cuneyt Cakir | Turkey | Nigeria v Argentina | 52 |
| 32 | Gianluca Rocchi | Italy | Japan v Senegal | 51 |
| 40 | Antonio Lahoz | Spain | Iceland v Croatia | 51 |
| 33 | Malang Diedhiou | Senegal | Uruguay v Russia | 50 |
| 35 | Enrique Caceres | Paraguay | Iran v Portugal | 50 |
| 44 | Nestor Pitana | Argentina | Mexico v Sweden | 50 |
| 48 | Milorad Mazic | Serbia | Senegal v Colombia | 50 |
| 14 | Wilmar Roldan | Columbia | Tunisia v England | 49 |
| 3 | Cuneyt Cakir | Turkey | Morocco v Iran | 45 |
My grouping of the referees:
60 minutes +
55-59 Minutes
45-54 Minutes
