Antwi once attended a national training camp with the Ghana national under-23 football team for the 2011 CAF U-23 Championship qualification.
2011 | 2011 ATP Challenger Tour | World Rally Championship | World Championship | NCAA Men's Division I Basketball Championship | Ultimate Fighting Championship | World Championship Wrestling | 2011 ATP World Tour | 2011 Rugby World Cup | 2011 ITF Women's Circuit | 2011 Tōhoku earthquake and tsunami | 2011 Pan American Games | 2011 Christchurch earthquake | World Touring Car Championship | Six Nations Championship | County Championship | British Touring Car Championship | World Chess Championship | national championship | All-Ireland Senior Hurling Championship | 2011 Summer Universiade | Football League Championship | Extreme Championship Wrestling | Bowl Championship Series | 2011 Pacific Games | Championship | All-Ireland Senior Football Championship | 2005 World Touring Car Championship season | The Open Championship | World Sportscar Championship |
In 2011 he led the under-23 side in winning the 2011 CAF U-23 Championship, thus qualifying Gabon for the 2012 Summer Olympics in London.