He was born in Fribourg. He competed at the 2008 World Junior Championships, the 2009 European Indoor Championships, the 2010 World Indoor Championships without reaching the final, and the 2011 European U23 Championships. In the 4 x 100 metres relay he finished fourth at the 2007 European Junior Championships and competed at the 2009 World Championships.
His personal best times are 6.61 seconds in the 60 metres (indoor), achieved in March 2011 in Paris in European Indoor Championship; 10.41 seconds in the 100 metres, achieved in June 2009 in Bellinzona; and 21.39 seconds in the 200 metres, achieved in May 2009 in Genève. He also holds the Swiss record in the 4 x 100 metres relay.
In July 2018 Mancini was banned indefinitely by the Swiss Athletics Federation due to his far-right political views and racist agitation, Mancini had compared the French national football team to monkeys in social media after their 2018 FIFA World Cup victory and used the antisemitic Quenelle salute in competition.
- Pascal Mancini at IAAF
- European U23 Championships, Ostrava - 100m Qualifications
- "European Athletics Junior Championships Hengelo, Netherlands 19 - 22 July 2007 Results - day 4" (pdf). European Athletics. p. 6. Retrieved 13 March 2010.
- "Men 4x100m Relay Athletics World Championship 2009 Berlin (GER)". Todor Krastev. Retrieved 13 March 2010.
- IAAF Newsletter No.135 (Jul/Aug). IAAF (28 August 2012). Retrieved on 2012-09-02.
- Pascal Mancini suspendu deux ans pour dopage. 20 Minutes. Retrieved on 2012-09-02.
- Nach Rassismus-Vorwürfen - EM-Aus und Lizenz-Entzug für Mancini. SRF (31 July 2018). Retrieved on 2018-08-01.
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