are Joakim Nyström and Shelby Cannon from the same country?
no
Joakim Nyström
Joakim "Jocke" Nyström (born 20 February 1963) is a former top ten ranked tennis player from Sweden who won 13 singles titles during his professional career.
 The right-hander reached his highest singles ranking on the ATP Tour on 31 March 1986, when he was ranked World No. 7 and was also ranked as high as World No. 4 in doubles that same year.
Shelby Cannon
Shelby Cannon (born August 19, 1966, in Hattiesburg, Mississippi) is an American retired professional tennis player.
1985 Volvo International – Singles
Joakim Nyström was the defending champion but did not compete that year. 1990 SkyDome World Tennis Tournament – Singles
Joakim Nyström was the champion of the event when it last took place, in 1986.
 He did not participate in 1990.
<br>Ivan Lendl won the title, defeating Tim Mayotte 6–3, 6–0, in the final. 1987 Grand Prix de Tennis de Lyon – Singles
Yannick Noah won the title, beating Joakim Nyström 7–6, 4–6, 7–6 in the final. 1986 Bavarian Tennis Championships – Singles
Joakim Nyström was the defending champion, but did not participate this year. 1986 ABN World Tennis Tournament
The 1986 ABN World Tennis Tournament was a men's tennis tournament played on indoor carpet courts at Ahoy Rotterdam in the Netherlands that was part of the 1986 Nabisco Grand Prix.
 It was the 14th edition of the tournament and was held from 24 March through 30 March 1986.
 Fourth-seeded Joakim Nyström won the singles title. 1985 Bavarian Tennis Championships
The 1985 v was a Grand Prix Tennis Circuit tournament held in Munich, West Germany which was played on outdoor clay courts.
 It was the 69th edition of the tournament and was held form 6 May through 12 May 1985.
 Joakim Nyström won the singles title. 1985 Buick WCT Finals – Singles
John McEnroe was the defending champion but lost in the quarterfinals to Joakim Nyström. 1990 SkyDome World Tennis Tournament – Doubles
Wojciech Fibak and Joakim Nyström were the champions of the event when it last took place, in 1986.
 Neither of them participated in 1990.
<br>Patrick Galbraith and David Macpherson won the title, defeating Neil Broad and Kevin Curren 2–6, 6–4, 6–3, in the final.