Question: What sport did Jason Porplyzia play, in which two teams of eighteen players compete on an oval-shaped field which is often a modified cricket ground?

Context articles: County Cricket Ground, Hove
Central Recreation Ground
Tremorvah Cricket Ground
Australian rules football positions
List of tied One Day Internationals
Newlands Cricket Ground
Chatteris Cricket Ground
Jason Porplyzia
Australian rules football
Mikkelberg-Kunst-und-Cricket Center

The County Cricket Ground, also known as the 1st Central County Ground for sponsorship reasons, is a cricket venue in Hove, East Sussex, England.
 The County Ground is the home of Sussex County Cricket Club, where most Sussex home matches since 1872 have been played, although many other grounds in Sussex have been used.
 Sussex CCC continue to play some of their games away from The County Ground, at either Arundel Castle and Horsham.
 It is one of the few county grounds to have deckchairs for spectators, in the Sussex CCC colours of blue and white, and was the first cricket ground to install permanent floodlights, for Day/night cricket matches (and the second ground after Edgbaston) to host a day/night match in England, in 1997.
The Central Recreation Ground was a cricket ground in Hastings, East Sussex, used for first-class and List A cricket between 1864 and 1996.
 The ground was frequently used by Sussex County Cricket Club as one of their outgrounds from 1865; in total, Sussex played 143 first-class and 17 List A matches at the ground.
 Between 1887 and the 1960s, the Central Recreation Ground also played host to the Hastings & St Leonards cricket festival, which attracted many other teams and notable players.
 In the early twentieth century, the ground hosted seven Gentlemen v Players matches, and notable players to have played at the ground include W.G. Grace, Don Bradman, Jack Hobbs and Denis Compton.
 Grace made over 40 appearances at the ground, whilst both Hobbs and Compton broke the record for most first-class centuries in a season at the Central Recreation Ground.
 The ground also hosted a women's one-day international between England and New Zealand in 1984.
 In the 1980s, planning permission was given for the ground be demolished, and the land used to build a shopping centre.
 After the demolition of the ground in 1996, the Priory Meadow Shopping Centre was built on the site.
Tremorvah Cricket Ground was a cricket ground located just outside Truro, Cornwall.
 The first recorded match to be played on the ground was a first-class match between an England XI and the touring Australians in 1899, which the Australians won by 7 wickets.
 During the match, Len Braund of the England XI made the highest individual score with the bat of 63, while the Australians Ernie Jones took the best bowling figures with 7/31.
 This was the only first-class match to be played at the ground.
 Cornwall first played there in a friendly against Glamorgan in that same year, while they played their first Minor Counties Championship at the ground in 1904 against Monmouthshire.
 They played a further fixture there against Devon in that same season, with the ground hosting a single Minor Counties Championship match from 1905 to 1912, when Cornwall played their last fixture there against the Kent Second XI.
 Long since abandoned for cricketing purposes, it is likely the ground was located in the grounds of Alverton Manor, a likely location for it being in the western grounds of the manor, on two sites, one of which is now covered by housing and the other which is partially open land and partially covered by Truro Magistrates Court.
 The ground remains the only venue in Cornwall to have hosted first-class cricket and the most westerly part of England in which first-class cricket has been played.
In the sport of Australian rules football, each of the eighteen players in a team is assigned to a particular named position on the field of play.
 These positions describe both the player's main role and by implication their location on the ground.
 As the game has evolved, tactics and team formations have changed, and the names of the positions and the duties involved have evolved too.
 In total there are 18 positions in Australian rules football, not including 4 (sometimes 6 - 8) interchange players who may come onto the ground at any time during play to replace another player.
A One Day International (ODI) is a form of limited overs cricket, played between two teams that have international status, as determined by the International Cricket Council (ICC).
 The first ODI match was played between Australia and England in 1971 at the Melbourne Cricket Ground, as a 40-over match.
 An ODI can have three possible results—it can be won by either of the two teams, it could be tied, or it could be declared to have "no result".
 In cricket, a match is said to be tied if it ends with both the teams scoring exactly the same number of runs and with the side batting second having completed its innings with all 10 batsmen being out or the predetermined number of overs having been completed.
 In case of rain-affected matches, the match is tied if the Duckworth–Lewis method indicates that the second team exactly meets but does not exceed the par score.
 There have been two occasions where a match has been tied, that the team which had lost fewer wickets was declared the winner.
 Pakistan was involved in both matches, losing one against India and winning the other against Australia.
Newlands Cricket Ground (known as PPC Newlands for sponsorship reasons) in Cape Town is a South African cricket ground.
 It is the home of the Cape Cobras, who play in the Sunfoil Series, Momentum 1 Day Cup and RamSlam Pro20 competitions.
 It is also a venue for Test matches, ODIs and T20Is.
 Newlands is regarded as one of the most beautiful cricket grounds in the world, being overlooked by Table Mountain and Devil's Peak.
 It is close to Newlands Stadium, which is a rugby union and football venue.
 The cricket ground opened in 1888.
Chatteris Cricket Ground is a cricket ground in Chatteris, Cambridgeshire.
 The first recorded match on the ground was in 1832, when Cambridge Town Club played the Marylebone Cricket Club in the ground's only first-class match.
 The ground was first used for Minor Counties Championship cricket when Cambridgeshire played Lincolnshire in 1967.
 From 1967 to 1971, the ground hosted 4 Minor Counties Championship matches, the last of which saw Cambridgeshire play Bedfordshire Chatteris CC was formed in 1879 and it is uncertain if the field used in 1832 is the same one currently used by the town club in Wenny Road.
Jason Porplyzia (born 27 November 1984 in Adelaide, South Australia) is a former Australian rules football player with a Ukrainian background in the Australian Football League.
 He wore the number 40 for the Adelaide Football Club, and was known as a dangerous forward with a strong mark for his size.
 He was also widely regarded as one of the most accurate kicks for goal in the competition.
 He was known by a number of nicknames, including "the Porpoise", Needles and Porps.
Australian rules football, officially known as Australian football, or simply called football or footy, is a contact sport played between two teams of eighteen players on an oval-shaped field, often a modified cricket ground.
Mikkelberg-Kunst-und-Cricket Center is a cricket ground in Hattstedt, Germany.
 The first recorded match on the ground was held in 1991 when Denmark Women played the Netherlands Women in a neutral fixture.
 The ground later served as a neutral venue for the two teams in four Women's One Day International, two in 1997 and two in 1998.
 These are the only major international cricket matches to be held in Germany.
 It is the home ground of Husum Cricket Club.