"It's a full flex" - Andre Agassi proudly proclaims wife Steffi Graf as his 'GOAT'

Andre Agassi proudly declared his wife Steffi Graf as his all-time 'GOAT' of tennis alongside a heartwarming trip down memory lane from the German's record-breaking triumph at the 1988 Olympics. Widely regarded as one of the greatest players ever, Graf won 22 Grand Slam singles titles during her time on the tour.

She was ranked No. 1 in the women's charts for 377 weeks, the most by any female player, and won a whopping 107 career titles over a 16-year career.

Graf's achievement as a 19-year-old in 1988, however, will live long in the memory of tennis fans. She became the first player in history to win the Golden Slam. A term coined by the media at the time, the Golden Slam was bestowed upon anybody who won all four Grand Slams and the Olympic gold in the same calendar year. Graf remains the only person in the sport's history to have achieved the feat.

Agassi recently celebrated that historic achievement on Instagram with an archived picture of Graf clad in a German jumpsuit showing off her Gold medal in Seoul.

Responding to fans in the comments section, Agassi echoed the sentiment of one fan who deemed Graf as the 'GOAT' of tennis.

Another fan cheekily suggested being her husband was a 'casual flex.' Agassi corrected him by saying that it was in fact a 'full flex.'

Agassi was no slouch on the tour himself. He won eight Grand Slam singles titles and one Olympic gold medal across 20 years on the tour. He's achieved the career Grand Slam and is the only man in the Open Era to have won a career Super Slam (career Grand Slam, plus the Olympic gold medal and the year-end championships).

Agassi and Graf's relationship has often been hailed as tennis' greatest love story. The couple tied the knot in a low-key ceremony in 2001. They have two children together, a son Jaden Gil Agassi, and a daughter, Jaz Elle Agassi.

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Revisiting Steffi Graf's Historic 1988 Golden Slam

Steffi Graf entered the 1988 Australian Open as the top seed after having won her first Grand Slam title at the 1987 French Open. She did not lose a set during the tournament, beating third seed Chris Evert 6-1, 7-6 in the summit clash to claim her first Australian Open crown.

Defending champion at the French Open, Graf once again went on to win the crown without dropping a single set. She brushed aside Belarus’ Natasha Zvereva 6-0, 6-0 in a final that lasted just 34 minutes, and what remains to be the only ‘double bagel’ Grand Slam final in the Open Era.

She didn't drop a single set en route to the finals at the Wimbledon Championships, seeing off the likes of Mary Joe Fernandez and Pam Shriver on the way. Up against record six-time defending champion, the legendary Martina Navratilova in the final, Graf remarkably overcame a one-set deficit to eventually come out on top in three sets 5-7, 6-2, 6-1.

Graf completed the career Grand Slam at the US Open, beating her Grand Slam-winning doubles partner Gabriela Sabatini 6-3, 3-6, 6-1 in the final.

She would go on to script history at the 1988 Olympics in Seoul, once again getting the better of Argentina's Sabatini in the final 6-3, 6-3 to complete a truly remarkable Golden Slam.