Are Mate Pavić and Raffaella Reggi from the same country? 
no
Raffaella Reggi
Raffaella Reggi (born 27 November 1965; ] ) is a former professional tennis player from Italy.
Mate Pavić
Mate Pavić (born 4 July 1993) is a Croatian professional tennis player specialising in doubles.
 Mate won the 2016 US Open mixed doubles title in partnership with Laura Siegemund, and reached the 2017 Wimbledon Championships men's doubles finals partnering Oliver Marach.
1989 Pilkington Glass Championships – Singles
Martina Navratilova was the defending champion and won in the final 7–6, 6–2 against Raffaella Reggi. 2017 ASB Classic – Men's Doubles
Mate Pavić and Michael Venus were the defending champions, but Pavić chose to compete in Sydney instead.
 Venus played alongside Robert Lindstedt, but lost in the first round to Nicholas Monroe and Artem Sitak. 2017 Open 13 – Doubles
Mate Pavić and Michael Venus were the defending champions, but Venus chose to compete in Delray Beach instead.
 Pavić played alongside Alexander Peya, but lost in the quarterfinals to Robin Haase and Dominic Inglot. 1988 Virginia Slims of San Diego – Singles
Raffaella Reggi was the defending champion but did not compete that year. 2017 Open Sud de France – Doubles
Mate Pavić and Michael Venus were the defending champions, but Pavić chose to compete in Sofia instead.
 Venus played alongside Robert Lindstedt, but lost in the quarterfinals to Alexander and Mischa Zverev. 2017 US Open – Mixed Doubles
Laura Siegemund and Mate Pavić were the defending champions, but Siegemund was unable to compete due to injury.
 Pavić played alongside Andreja Klepač, but lost to Alicja Rosolska and Santiago González in the first round. 2017 Ricoh Open – Men's Doubles
Mate Pavić and Michael Venus were the defending champions, but Pavić chose to compete in Stuttgart instead.
 Venus played alongside André Sá, but lost to Łukasz Kubot and Marcelo Melo in the semifinals. 1987 US Open – Mixed Doubles
Raffaella Reggi and Sergio Casal were the defending champions but lost in the semifinals to Martina Navratilova and Emilio Sánchez.