Cool thread vbranis! Off the top of my head, here are a few honorable mentions, preferences, contenders and additions.....
Italy's all-time great Davis Cupper: Nicola Pietrangeli
Croatia: toss-up. Nikki Pilic and Goran Ivanisevic. Pilic as a member of the handsome 8 and as a coach/mentor. Goran gets my vote, though.
Ecuador: Andres Gomez, the 1990 Roland Garros Champion.
Mexico, honorable mention: Raul Ramirez
New Zealand: Chris Lewis, once a Wimbledon finalist in men's singles
Bulgaria: The Maleeva sisters
USA: I'm with you on Sampras, but we'd have to at least mention Budge, Tilden, Kramer and Gonzales
Canada: Carling Bassett wins the cute girl player award. In men's dubs... Glenn Michibata
Indonesia: Yayuk Basuki and Peter Handoyo (played for Univ. of Tennessee in the late 90s)
Georgia (Caucasus Mtns, not Bulldogs): Nino Louarsabishvili, though Alex Metreveli and Teimuraz Gabashvili have represented Russia well.
Madagascar: Dally Randriantefy
Japan: Zenzo Shimizu, Shuzo Matsuoka, Kimiko Date-Krumm, Ai Sugiyama, Noriyuki "Pat" Morita
Chile: Marcelo Rios
Serbia: Nole, NoleNoleNole....NOLE, No-Le. Well, my vote is for Slobodan Zivojinovic, actually, 'cause Nole's second serve is such a liability. So is his character. Little twit.
Prussia: Kathy Jordan, who hails from the town of King of Prussia, Pennsylvania
The Phillippine Islands: Cecil Mamiit. The Junio brothers? Mid 90's college tennis, yeah.
Brazil: as much as I love Guga, I've got to go with Maria Bueno
South Africa: Gavin Forbes, 'cause he wrote that book, A Handful of Summers. Oh, yeah, and Johan Kriek. And that skinny guy who beat Mac and Connors at Wimbledon, then lost to a 17 yr old kid in the final. He's the one who wanted to blow up the USTA NTC in Flushing. Cliffy Drysdale would have won this if he just hadn't worn that prissy little golf glove.
India: Ramanathan Krishnan, the father of Ramesh Krishnan, affectionately known the world over as 'Krish'.
Pakistan: Mahboob Khan, for his notoriety here at the TW and his famous last name, both in history and in squash, the other-other racquet sport.
Scotland: Mike Myers as Scotland Yard's very own 'Fat B@stard' slipped Andy Murray a mickey and made off with the trophy.
Holland: Tom Okker, partially because Krajicek sounds so Czech, but also because Okker's nickname is the Flying Dutchman....and not everyone can play dubs with Ilie Nastase.
Belguim: Filip DeWulf or Xavier Malisse? Justine Henin or Aussie Kim? My vote is for Juiced-teen.
Louisiana: Donni Leaycraft.
Nigeria: Nduka Odizor
Cameroun: Yannick Noah, only because there are a couple of guys ahead of him on the France list.
Egypt: Ismael El Shafei anyone? Anyone?
Cyprus: Marcos Baghdatis
Lebanon: Marcos Baghdatis
Uruguay: Marcelo Filipini
Paraguay: Hugo Chapacu
Bahamas: Mark Knowles. Kidding, everyone knows the Bahamian GOAT is Roger Smith.
Bermuda: One-time resident, Patrick Rafter.
Monte Carlo: Boris Becker
Luxembourg: Gilles Muller
Moldova: Ion Moldovan, who is actually a Romanian, but, come on, that last name screams GOAT of Moldova.
Kazakhstan: Elena Likhovtseva. Borat like. Eh very niice.
Dutch Antilles: Jean Julien Roger. ANd, HOW exactly did you miss this one?
Appalachia: Roscoe Tanner
Zimbabwe: The good money is on Byron Black, but I'm voting for former NCAA no. 1, Genius Chidzikwe. There's no denying a man named Genius. The son of a man named Clever.
Belarus: The Minx from Misk - Natalia (Natasha) Zvereva. Max Mirnyi, too. They must really GET dubs strategy in that country.
Brooklyn, New York: Max Mirnyi
Armenia: Sargis the Sarge Sargsian
Vermont: Bode Miller. Okay, now I'm rambling. Vermont isn't its own country. Yet.