Henin then helped Belgium defeat Austria 5–0 in a first round tie of the Fed Cup.
In May, Henin successfully defended her title at the Qatar Telecom German Open in Berlin.
France's world number 38 Alize Cornet added: "Good job ATPWorld Tour. #backtozero" Most of the players involved looked bewildered during the ceremony, which is run by the ATP, the governing body of the men's game, in partnership with the Italian Tennis Federation and the Italian Olympic Committee.
The Italian Tennis Federation said it was not involved in the organisation of the event, which it said was arranged by the ATP.
Before, in April, Monfils was seen supporting Cibulkova at the Fed Cup tie between the Slovak Republic and Uzbekistan which took place in Bratislava.
The 19-year-old Cibulkova is not the first tennis player Monfils has been linked to, before the cute Slovakian there was Frenchwoman Alize Cornet.
In 1995, shortly after her mother's death, Henin met her coach Carlos Rodríguez who guided her career both before her retirement in 2008 and during her 2010 comeback.
Following a conflict between Justine and her father over her tennis career and her relationship with Pierre-Yves Hardenne, Rodríguez soon became not only her trainer but in some ways a second father figure. In 1997, she won the junior girls' singles title at the French Open.
Henin saw the 1992 final involving her idol Steffi Graf and Monica Seles.
The players were asked to select a model to escort them down a catwalk arm in arm before the model then revealed their group letter to the audience.
The ATP Next Gen Milan draw ceremony made players select models to determine their groups. pic.twitter.com/g63Of K5IOK — Ben Rothenberg (@Ben Rothenberg) November 5, 2017One woman lifted up her dress to show the letter 'A' written on her thigh while another took off her jacket, with the letter 'B' marked on her back.
Former Wimbledon champion Amelie Mauresmo has branded an ATP draw ceremony a "disgrace" after young male players were made to choose female models to reveal their opponents.
The draw was held in Milan on Sunday to determine the groups for the next Next Gen ATP Finals, a tournament taking place this week featuring eight of the world's best players aged younger than 21.