[14] In 1921 he decided to compete in Paris, which was the center of tennis life, and registered for the French Covered Courts tournament second-class draw, in which he reached the final where he beat Jean Borotra in five sets.

[16] In February 1922 Cochet traveled to the World Covered Court Championships in Saint Moritz in Switzerland where he defeated Borotra in a five-set final and formed a team with him to gain the doubles trophy against Jacques Brugnon and Marcel Dupont.

[14] He clinched the 1922 World Hard Court Championships in Brussels defeating Count Manuel de Gomar in the singles final and triumphing in the doubles events, partnering Jean Borotra and Suzanne Lenglen respectively.

[22] At the 1924 Summer Olympics Cochet won the silver medal in both the singles and doubles with his teammate Borotra, while Vincent Richards took the gold for the United States in both events,[23] pairing with Frank Hunter for the latter.

[34] At the so-called "Black Thursday", three Americans yielded to the French, Cochet defeated Tilden, ending his six-year winning streak at Forest Hills and only lost to compatriot Lacoste who became the first foreign US champion since Laurence Doherty in 1903.

[28] All these achievements were a prelude to the 1927 Wimbledon Championships where in successive rounds fourth-seeded Cochet defeated two leading Americans Frank Hunter and Bill Tilden and finally Jean Borotra in remarkable five set matches, all of whom had a two-sets advantage against him.

[53][54] In the Monaco Cup at the La Festa Country Club Cochet turned the tide from two sets down against two-times reigning champion Béla von Kehrling, the first meeting of a rivalry that continued onward into the year.

[58] In Menton at the official Riviera Championships eventual singles victor Von Kehrling and former Danish Champion Erik Worm warded off Cochet and Count Salm in the doubles final.

[66] The doubles match between Von Kehrling – Jenő Péteri and Cochet – Roger Danet was indefinitely suspended due to bad light conditions at one set each.

[28] Cochet and recurring partner Bennett added the French hard courts mixed title to their set of accolades after defeating Helen Wills, women's world champion, and Frank Hunter, the No.

[70] At the end of July in the Challenge round of the Davis Cup at Roland Garros the Musketeers, with the absence of Brugnon, defeated the United States to keep the trophy in French possession.

[45][72] In October the French supremacy continued with him and Christian Boussus sharing the final Pacific Southwest Championships of Los Angeles, Cochet claimed that title as well.

[80] The 1929 season did not begin as flawless as the previous one; on 20 January Jean Borotra beat Cochet in their first ever Belgian Covered Courts tournament final, which took five sets to decide.

[88] With Lacoste – Borotra's victory over Tilden – Hunter and Cochet – Brugnon's easy win over Gregory – Collins in the semi-finals secured the Four Musketeers their third doubles face-to-face final.

In the mixed doubles draw the titleholders Cochet and Eileen Bennett Whittingstall lost to eventual runners-up Joan Fry and Ian Collins in three sets.

A couple of days later in the Regent's Park the top Wimbledon players participated in an exhibition event to raise funds for children of the British war cripples.

[104] His most successful French Championships came in this year when he was close to winning a triple crown after being victorious in singles over Bill Tilden, in doubles with Jacques Brugnon over Harry Hopman and James Willard and was a finalist in the mixed tournament as well.

[106] In the sixth straight United States–France Davis Cup final the American team had a great start thanks to Bill Tilden, who handed Borotra the first loss of the tie.

[107] At the end of the year Cochet was ranked World number one amateur by A. Wallis Myers,[108] Pierre Gillou,[109] and Didier Poulain (L'Auto)[110] but came second in the list of Bill Tilden behind Borotra.

The doubles final remained unconquered for Brugnon and Cochet as the team of George Lott and John Van Ryn came back from 3–2 down in the fifth set to win the match.

The match was suspended multiple times due to rain, which made the court almost unsuitable for playing, which left its mark on the deciding rubber between Cochet and Perry.

[114] Despite his turbulent year Cochet was ranked number one by A. Wallis Myers,[118] Pierre Gillou,[119] Didier Poulain,[120] Stanley Doust,[121] Bill Tilden,[122] Noel Dickson (Melbourne Herald),[123] "Service" (Western Mail)[124] and Sport magazine (Zurich).

[136] In November Cochet only competed in the Toussaint tournament, held at the Tennis Club de Paris, alongside Colette Rosambert with whom he lost to Jean Borotra and his more skilled female partner Helen Wills Moody.

[138] In June 1933 Cochet, seeded first, relinquished his French Championships title to Australian Jack Crawford, who overwhelmed him in the final in three straight sets, becoming the first non-French player to possess it.

[155] In late May Philadelphia hosted the Middle States tournament at its Germantown Cricket Club; Cochet advanced to the semi-final where Tilden's superiority proved to be his undoing.

[154] In France the official tour continued in Bayonne in August, where Cochet dropped his two singles matches to Tilden and Keith Gledhill in front of a home crowd.

[154] Two weeks later in a single-elimination tournament at Cochet's native Lyon Football Club he almost delighted the crowd with home victory but Tilden stole the second and third set to spoil the feat.

[156] Cochet spent most of 1935 with a promotional tour across the globe, sponsored by the French government, which included Egypt, India, East Indies, Singapore, the Philippines, Vietnam, China and its final destination Australasia.

[162] In 1936 Cochet had a second chance to regain his spotlight when he was first seeded French Pro Championship after Bill Tilden and Bruce Barnes failed to show up due to travel issues.

[163] Cochet found consolation in the doubles, where he completed a round robin flawless streak with his teammate Ramillon especially the last match over the American pair Lester Stoefen and Bill Tilden.