It was here that Peers gained his first Grand Slam victory, upsetting the Polish duo of Mariusz Fyrstenberg and Marcin Matkowski in their opening match; in the second round they fell to Sergiy Stakhovsky and Mikhail Youzhny in straight sets.

In February, Peers teamed up with established doubles specialist Jamie Murray, a partnership that immediately looked to be a successful one, as the pair reached the semifinals of their first tournament together at the Open Sud de France.

1 pair Bob and Mike Bryan in the final of the U.S. Men's Clay Court Championships after coming back from a set down.

[4] The pair played their first Grand Slam tournament together at the French Open, however despite taking out the 15th seeded team of Knowle and Polášek in the first round, they ultimately fell in their next match against the Colombian duo of Juan Sebastián Cabal and Robert Farah Maksoud.

They headed to Wimbledon in a confident mindset, however, went out in the first round to James Blake and Jürgen Melzer in a 5-set thriller that ended 14–12 in an 87-minute final set.

Their early loss did not dishearten them however, and the pair went on to win their second title of the year a few weeks later, at the Crédit Agricole Suisse Open Gstaad.

At the US Open, the pair had their most successful run at a Grand Slam tournament, making it all the way to the quarterfinals, defeating ninth seeds David Marrero and Fernando Verdasco on the way.

Peers competed in his first ever Masters 1000 tournament at the Shanghai Masters, where he and Murray defeated established doubles champions Julien Benneteau, Nenad Zimonjić and Robert Lindstedt on their way to the semifinals, where they lost in straight sets to Spanish duo of Marrero and Verdasco, in a closely fought contest that ended up being decided by two tiebreakers.

Peers played next at the 2014 ABN AMRO World Tennis Tournament with Julian Knowle while Jamie Murray was out with injury.

Peers next played the Indian Wells Open with regular partner Jamie Murray but the pair lost in the first round to Benneteau and Roger-Vasselin.

They next played at the Sony Open Tennis but lost in straight sets to sixth seeds Daniel Nestor and Nenad Zimonjić.

Peers and Murray started their clay court season at the Grand Prix Hassan II where they were seeded seconDlouhý]] and Tomasz Bednarek in straight sets.

They made a second consecutive semi-final at the BRD Năstase Țiriac Trophy before losing to top seeds Jean-Julien Rojer and Horia Tecău.

They followed this up by reaching the third round of the French Open, which was both their best result at the tournament, where they were defeated by top seeds Bob and Mike Bryan.

The pair's good form continued in Rotterdam, where after losing in the qualifying rounds they were handed a first-round match as lucky losers following a withdrawal.

As a member of the Australian Davis Cup squad, Peers played a World Group 1st round rubber with Lleyton Hewitt against the American couple Bryan/Bryan.

This time the outcome was reversed allowing Peers to celebrate his second ATP tournament title of the year with his Finnish companion.

With Sam Groth he defeated Martin/Zelenay of Slovakia, leading Australia to 3–0 victory that guaranteed a place in the following year's World Group.

One week later at the BNP Paribas Masters event in Paris the duo made it all the way to the final without dropping a set where they again met Herbert and Mahut.

Peers began the new year with his regular doubles partner Kontinen at Brisbane as the second seeds, however lost in the first round to Nishikori/Thiem in three sets.

Peers and Kontinen then faced Colombian pair Cabal and Farah and won in three gruelling tiebreakers to progress to the quarterfinals.

Alongside Storm Sanders, Peers won the mixed doubles title at the US Open, over coming Kirsten Flipkens and Édouard Roger-Vasselin in the final which went to a deciding champions tiebreak.

[8][9] At the 2024 Paris Olympics, he partnered Matthew Ebden and defeated the United States' Austin Krajicek and Rajeev Ram in the final to win Australia's first tennis gold medal since 1996.

[10] Partnering Jamie Murray, he won the title at the 2024 Swiss Indoors, defeating Wesley Koolhof and Nikola Mektić in the final.

[13] Partnering Olivia Gadecki, Peers won the mixed doubles title at the Australian Open, defeating Kimberly Birrell and John-Patrick Smith in the final.