Manawatu Upon leaving school, Baker was contracted by the
Manawatu Rugby Union. In his second year out of school he was a part of 's 2008 national provincial championship squad. He was spotted by coach
Dave Rennie and had signed with Manawatu at just 20 years old. Baker made his debut for Manawatu in the
2008 Air New Zealand Cup competition, coming on as a replacement against in a
Ranfurly Shield match. He went on to make his starting debut against , whilst also scoring his first professional
rugby union try. Returning to Manawatu for the
2009 Air New Zealand Cup, Baker scored three tries, the province's
second top try scorer of the year along with three fellow players. He also was suspended from all rugby for eight weeks after allegedly verbally abusing assistant referee Zarne Johnson in a competition match between and Manawatu. Baker was also charged with allegedly threatening Johnson.
Highlanders Baker was signed by the after an impressive
ITM Cup and New Zealand sevens campaign in 2010; he signed a two-year deal with the
Otago-based
Super Rugby franchise. A stress fracture in his back – which he suffered in Delhi winning gold at the
Commonwealth Games – had ruled Baker out of all rugby for three months. Though he was expected to overcome the injury before the
2011 Super Rugby season started, a scan in February showed the fracture had not mended and he was subsequently released by the Highlanders to their wider training group and was then replaced in the Highlanders squad by
Kade Poki.
Andre Taylor was Taranaki's preferred fullback throughout 2011, but Baker, who had re-signed with through until the end of 2012, was recalled by the Highlanders despite lasting just one full game during the shortened
ITM Cup season. He eventually made his debut for the Highlanders in the third round of the
2012 Super Rugby season, coming on as a replacement against the in
Dunedin. Baker made a further four appearances and scored two tries, one such try against the in round nine saw him chase a kick at pace to what ended up being the winning try. Baker did not return to the Highlanders for the
2013 Super Rugby season, but instead signed with the as a member of their wider training group. In November 2013, Baker returned to the Highlanders after a successful ITM Cup campaign as a member of the Taranaki side that won the
2014 ITM Cup Premiership over . He signed with the side for two years after putting aside his sevens career to concentrate on
Super Rugby.
Taranaki In December 2009, Baker decided to move north to along with Manawatu teammate Andre Taylor, who both signed with the union on a two-year deal. He made his debut for the province starting at
fullback against in round one of the
2010 ITM Cup. After being sidelined throughout the
2011 Super Rugby season with a stress fracture in his back, the injury eventually improved and he managed to play several games for Taranaki in their
2011 ITM Cup campaign. Baker also featured in the squads infamous
Ranfurly Shield win over . Heading into the
2012 ITM Cup, he had scored nine tries in nineteen games for the province. Baker made an immediate impact with his decisive running and ability to spot a gap for Taranaki in 2012. His ability to put a player into space also caught the eye. He finished the year as the first-choice
fullback. At the end of the
2013 ITM Cup season, Baker was nominated for the Taranaki Sportsman of the Year award after a stand-out season. While he missed out on that award, Baker was given the Back of the Year award, Personality of the Year award and Try of the Year award for his superb try against . After a six-week ban for a dangerous tackle in the Highlanders' round 8 game against the , Baker badly tore a hamstring in club rugby in
Dunedin. After working his way back to fitness, he finally got a start for Taranaki against in the
2014 ITM Cup, only to suffer an AC joint injury just a few minutes into the game. However, he finished the season on a high, after being a part of Taranaki's narrow victory over at
Yarrow Stadium to win the province's first
ITM Cup Premiership title. Baker scored five tries and made a further eleven appearances in
2015.
Zebre On 18 June 2016, Italian
Pro12 club
Zebre announced that Baker would join the Italian club for the
2016–17 season. During that season, Baker played 517 minutes in 9 games (starting in 7) for Zebre and scored one try for the club in their game against
Glasgow Warriors. Baker did not return to Zebre for the second year of his contract.
Hawke's Bay The
Hawke's Bay Rugby Union announced on 3 August 2020 that Baker would join the Magpies for the
2020 Mitre 10 Cup season. It proved to be a successful move for Baker. He helped the Magpies win the
Ranfurly Shield (taking it off ), successfully defend the Shield three times against challenges from , and , and win the Mitre 10 Cup Championship title.
Old Glory DC On 9 December 2022,
Old Glory DC announced that club had signed Baker for the
2023 Major League Rugby season. ==International career==