Australia

When 15, Grove won the junior 1-metre springboard and open diving titles at the New South Wales diving championships in January 1969, defeating older rivals to claim the titles. He was the first junior to win the open title in the state since Jack Barnett in 1936, who was Grove's mentor and expressed his admiration for Grove's achievement.^[1] In January 1971 at the age of 17, Grove set a state record in Sydney, Australia in a three-metre diving event, scoring 491.05 in "a near-faultless set of dives", despite suffering with an injury earlier in the week that had required stitches.^[2] The following month in February, he broke his own world record, set just the year before, by performing 143 different springboard dives in Tempe, New South Wales during their annual dive-a-thon, 43 more than the year before.^[3]

Grove competed during the 1972 Summer Olympics, an experience which was regarded as "disastrous", after twice hitting the board with his feet. During the springboard event, he hit the board with his leg which resulted in "ones" in points awarded and an eventual finishing position of 27 out of 31. During the 10-metre high-board event, Grove clipped his toes and was awarded up to just three-and-a-halves, giving him a finishing position of 32 out of 35, knocking his confidence. Prior to the competition, Grove had performed well, with a fifth placed finish behind Italian Klaus Dibiasi, a former gold medalist, while he lamented that his participation in the Olympics was "the only time in competition I have ever hit the board with my legs". Later in 1972, he won the 1-metre New South Wales title and continued his clean sweet of open event titles, all of which he had won since his first event at aged 15.^[4]

In January 1973, Grove won the men's 3-metre spring board title held at Ryde swimming centre during the New South Wales diving championships, being awarded 465.45 points to secure his 15th consecutive title.^[5] During the trials for the 1974 British Commonwealth Games, Grove tore a shoulder muscle and was forced to withdraw, after being overlooked when the team was officially announced.^[6]

Towards the end of 1973, Grove participated in the Country-versus-City diving competition, held at the Canberra Olympic Pool, following his participation in the 1973 World Diving Championships in Belgrade. He was described by the Canberra Times as being the "star attraction".^[7] In the same month and what would be his last appearance for Australia, Grove broke three records at the 1-metre diving championships in New South Wales, setting a state record of 506.95 points, 30.15 higher than the record he previously set in 1971. His victory also secured him his 19th consecutive Open State title, which officials believed would not be broken "for many years".^[8] During a forward somersault performance, one judge awarded him 8.5 points out of 10, which was the highest awarded in a single performance during the whole day's events.^[6]

Austria

Grove left Australia around the end of 1973 to move to Austria, where he joined his fiancee. He expected to spend up to five years there, diving in a new indoor complex built in Vienna.^[6] In 1975, Grove renounced his Australian citizenship and intended upon applying for citizenship in Austria, citing that sportspeople in Austria get sponsorship and good opportunities to train, as well as "all the time they need for competition with full salary". He was award a scholarship at the Vienna Sports College with a $136 monthly allowance. The opportunities afforded to elite sportspeople in Austria were in stark contrast to Australia, where it was regarded that sportspeople were "largely left to fend for themselves".^[9] In a letter to his parents announcing his decision, Grove commented that he found it "impossible" to build his career while in Australia, contrary to life in Austria where he could get "the intense medical treatment which I will be having before I start 10-metre diving again", while noting that in Austria, he had many more opportunities to reach a professional level. His experiences were not uncommon, as it was reported that Australian sportspeople were falling behind competitors in Europe due to substandard facilities and lack of financial backing.^[10]

He competed for Austria during the 1980 Summer Olympics as one of the country's two diving representatives.^[11] During his career in Australia, Grove was considered as "a known rebel" against sports bureaucracy and is one of only two Australian Olympians to compete at the Olympics for two different countries.^[12]

In 1988, Grove gave a display of trampolining at the newly opened Union Volksbank Purgstall sports hall in Purgstall an der Erlauf, where his triple somersaults were described as being "a special treat".^[13]