Heimuli brought Fa to his Balmoral Lee Gar Gym in 2006 after discovering his coach failed to show at his first amateur fight.

He continued his winning streak with a first-round technical knockout over Jubilee Arama in the semi-finals but lost the final against Johan Linde to settle for second place.

His second season was during 2012–13 where he was drafted by the British Lionhearts where he fought the likes of Oleksandr Usyk and former multiple Olympic silver medalist, Clemente Russo.

In their fourth contest, Fa and Parker fought in a do-or-die opportunity to secure a place at the 2012 Summer Olympics during the Oceania Boxing Championships in Canberra, Australia.

He dropped the first round 2–1 but came back strongly in the second to secure a decisive 3-point lead that he protected when the final three-minute joust ended in stalemate.

Assembling an impressive team, Lolo Heimuli as coach, former New Zealand Olympic sprinter Mark Keddell as manager, Shane Cameron as mentor along with input from strength and conditioning guru Angus Ross.

[11] Fa showing he was far too good for Clint Foa'i whose corner threw the towel in during the first round after their fighter was hit hard in the ribs, his pain obvious.

Progressing to five straight victories, Fa added another win to his professional record, knocking out his debuting countryman Tussi Asafo in the first round.

Fa used his significant reach advantage effectively, keeping busy with his jab to frustrate A'asa who struggled to get on the inside.

Although A'asa kept busy with his stalking style but found few inroads against Fa's defense which included some great footwork to get out of troubling situations.

[17] Closing in on Fa's debut year as a professional, he featured once again on one of New Zealand's most promising boxing events, The Big Bash.

[19] But Fa was too strong, thumping Magrini with a third-round technical knockout, felling the diminutive Argentinian with a series of left-hand body blows.

[20] Late January 2017, it was announced Fa had agreed to terms signing a three-year deal, which included clauses for a possible fourth under the tutelage of Lou DiBella.

Moments later, Fa landed another body shot for another knockdown, and referee Flynn Gerald waved off the fight at 2 minutes, 36 seconds.

[23] In March, Fa prepared for the vacant New Zealand Professional Boxing Association heavyweight title against Daniel Tai, at the ABA Stadium in Auckland.

[24] With the title being vacant for almost five years and last held by Sonny Bill Williams, this was Fa's most difficult fight of his career to note as he was hampered by a back injury and forced to live off the jab.

[25] Fa won his twelfth pro-fight after defeating veteran Australian boxer Hunter Sam by unanimous decision.

The bout was the main event of the Indian Motorcycle Fight Night organised by New Zealand boxing legend Shane Cameron.

[31] Originally confirmed to fight Richard Lartey from Ghana, Fa instead fought the Mexican heavyweight champion Luis Pascaul for the interim WBO Oriental title.

[32] He headlined live on Sky Sports at the Mahatma Gandhi Centre in Auckland, an event promoted by Shane Cameron and co-promoted by Lou DiBella.

[33] He won a unanimous points victory over Pascaul but gained criticism after failing to find combinations to back up some punishing one-off punches.

Fa evidently won every round on the judge's scorecards with Pascual offering nothing on attack apart from lunging in for body shots.