[10] In June, Groenewegen won the Dutch National Road Race Championships after outsprinting Wouter Wippert.

[11] During a review of Groenewegen's Bianchi Oltre XR4 bicycle, Simon Richardson of Global Cycling Network said he is "a very easy rider to work with" in respect to the mechanics.

The stage, which was 174 kilometres (108 mi) long from Bridlington to Scarbrough, came down to a photo finish where he held off Australian sprinter Caleb Ewan.

[32] Groenewegen held the general classification lead until the third stage when he was penalised 20 seconds after illegally drafting behind his team's car after suffering a mechanical fault.

The blue jersey, given to the race leader, was lost to Elia Viviani who started the day two seconds behind Groenewegen, who dropped out of the top 10.

[35] The stage was the longest in the tour at 231 km (143.5 mi) which started in Fougères and finished in Chartres, Northern France.

He beat Caleb Ewan and Sagan, giving him his fourth Tour de France stage win.

Groenewegen's 2020 season started well, with victories on stages 1 and 3 as well as the points classification of the Volta a la Comunitat Valenciana.

[49]During stage 1 of the Tour de Pologne in Katowice, Poland on 5 August, Groenewegen pushed Fabio Jakobsen into the barriers surrounding the finish line causing a very serious crash that put his rival in hospital and eventually in a medically induced coma.

[51] Jakobsen's directeur sportif Patrick Lefevere said at the time that his team were considering bringing criminal charges against Groenewegen.

[56] In December 2021, Groenewegen signed a three-year contract with Australian UCI WorldTeam Team BikeExchange–Jayco from 2022 season.