[2] Dion took first place at the 1865 Tournament for the Championship of Canada, held June 15–19 of that year at Mechanic's Hall in Montreal.

[3] In 1866, Dion participated in the Tournament of State and Provincial Champions, held at the Hippotheatron in New York City on September 15 of that year.

Dion repeated his performance of the previous year at the Tournament for the Championship of Canada, going undefeated and also winning a gold mounted cue (results shown below).

[3] On June 1, 1870 A. P. Rudolphe, of Chicago, and Dion, played American four ball billiards for the championship of America for a purse of $1,000 a side, and a diamond champion cue.

The Hippotheatron, a circus building on Fourteenth street in New York City, opposite Irving place, was selected as the scene of battle.

[5] Another rematch between Dion and Rudolphe for the Championship of America was played on December 28, 1870 at the Academy of Music in New York City.

Dion was ultimately awarded the win before the end, having what was judged by the referees an indomitable lead by the 90th inning of 409 points.

The match was held in Chicago (Parker's home city) at the Crosby Opera House on April 27, 1871 in front of an audience of 1,500, which included at least 200 women.

[9] The first Championship of America at pool took place in 1878 at the Union Square Billiard Rooms in New York City.

The first player to count 61 or more points (being more than half of the total of all the ball numbers combined) wins a "frame".

Dion won the championship on April 20, 1878, beating out Gotthiel Wahlstrom of Sweden, 11 frames to 7, and received the title of Champion of America at pool, a gold medal and a cash prize.

[16] On April 10, 1871 the brothers formed a team and played scotch doubles against A. P. Rudolphe and John Deery at Platt's Hall in San Francisco.

[18] Fresh from multiple successful defenses of his title as Champion of America at the diamond title, as reported by the Fort Wayne Daily Gazette on July 18, 1871, "Cyrille Dion has issued a notice in which he challenges anyone in the world to play him a game of three ball or French carom, billiards, the amount of stakes to be not less than five hundred dollar a side.