List of Mario Tennis Aces online tournaments

This is a list of Mario Tennis Aces online tournaments. The game holds monthly online tournaments in which players need to advance through a number of matches (rounds) against other human opponents and beat the finals in order to win a championship. Depending on the degree of participation in these online tournaments, the player can earn various prizes such as new playable characters and costumes.

The following is a list of all online tournaments hosted from the release of the first demo up until now, along with the participation prizes handed out in each.

Pre-launch demo (May 2018)

Prior to Mario Tennis Aces's release date, a free demo was released on Nintendo eShop, including a limited-time online tournament. Characters could be unlocked for use in this demo by accumulating participation points. The Mario overalls costume could also be unlocked for the full game by completing one online match.

Tournament date	Participation bonuses
0 points	100 points	300 points	600 points	1000 points	1500 points
May 2018	Mario overalls costume (only usable in the full game)	Waluigi	Toad	Spike	Rosalina	Chain Chomp

June 2018 - November 2018

In these months, each tournament consisted of three preliminary rounds, followed by semifinals and finals. The player could only choose to play in Standard or Simple modes, both encompassed by the Singles class. The only participation bonus in every tournament (except for the June tournament) was a new playable character, which was unlocked by simply playing at least one round in the tournament.

Tournament date	Participation bonus
June 2018	N/A
July 2018	Koopa Troopa
August 2018	Blooper
September 2018	Diddy Kong
October 2018	Birdo
November 2018	Koopa Paratroopa

December 2018

As of December 2018, the tournaments have been reduced to only one preliminary round, followed by semifinals and finals, similarly to the COM tournaments. This tournament also added the Doubles class among the already-existent Standard and Simple classes. Exclusively in this tournament, the player could earn different participation bonuses depending on the class played.

Tournament date	Participation bonuses
December 2018	Petey Piranha (Standard Class or Simple Class)	Shy Guy (Doubles Class)

January 2019 - July 2019

The January 2019 tournament introduced Participation Points, which are earned in accordance to the player's performance in a match. By earning enough Participation Points in a tournament, the player unlocked new alternate costumes for certain playable characters. New playable characters were still awarded by simply playing at least one match in a tournament.

Tournament date	Participation bonuses
0 points	300 points	500 points	1000 points	2000 points
January 2019	Luma	N/A	Mario overalls costume	N/A	Luigi overalls costume
February 2019	Boom Boom	N/A	N/A	N/A	Toad tennis outfit
March 2019	Pauline	Chain Chomp white and yellow cap	N/A	Chain Chomp white and red cap	Chain Chomp white and green cap
April 2019	Kamek	Spike blue headband and blue wristband	N/A	Spike pink headband and pink wristband	Spike yellow headband and yellow wristband
May 2019	Dry Bones	N/A	N/A	Toad tennis outfit	Toadette tennis outfit
June 2019	Fire Piranha Plant	N/A	N/A	Bowser tennis outfit	N/A
July 2019	Dry Bowser	N/A	Wario overalls costume	Waluigi overalls costume	N/A

Special demo (April 2019 - May 2019)

Another demo was released on Nintendo eShop in April 2019. This demo was similar to the previous demo, although characters were unlocked by playing a set number of matches, rather than by accumulating participation points. These matches could be played either in or out of the limited-time tournament to unlock the rewards. The Mario overalls costume, once unlocked, could be used in both this demo and the full game.

Tournament date	Participation bonuses
1 match	3 matches	6 matches	9 matches	12 matches	15 matches
April 2019 - May 2019	Mario overalls costume	Waluigi	Daisy	Diddy Kong	Chain Chomp	Luma

August 2019 - current

With the addition of Dry Bowser through the July 2019 online tournament, all playable characters are available in Mario Tennis Aces. Therefore, characters are no longer available as participation bonuses. However, costumes can still be unlocked with Participation Points. Following the August 2019 online tournament, alternate costume rewards from previous online tournaments (January 2019 - August 2019) appear in a monthly sequence.

Tournament date	Participation bonuses
250 points	500 points	750 points	1000 points
August 2019; every February and August onwards	Koopa Troopa blue shell and blue shoes	Koopa Paratroopa blue shell and blue shoes	Koopa Troopa red shell and red shoes	Koopa Paratroopa green shell and green shoes
September 2019; every March and September onwards	N/A	Mario overalls costume	N/A	Luigi overalls costume
October 2019; every April and October onwards	Chain Chomp white and yellow cap	Chain Chomp white and red cap	N/A	Chain Chomp white and green cap
November 2019; every May and November onwards	N/A	Toad tennis outfit	N/A	Toadette tennis outfit
December 2019; every June and December onwards	Spike blue headband and blue wristband	Spike pink headband and pink wristband	Spike yellow headband and yellow wristband	Bowser tennis outfit
January 2020; every July and January onwards	N/A	Wario overalls costume	N/A	Waluigi overalls costume