The clay court grade two event will draw the world's leading youngplayers including Slovakia's Lukas Lacko, Yaraslau Shyla of Belarus andNik Razborsek of Slovenia.
Thien said he would becompeting in a series of events during his time in Europe in a bid toclimb the International Tennis Federation (ITF) Juniors rankings.
Thien, who has climbed from 234th to 225th following eight wins andthree losses in ITF tournaments this year, will compete in five moreGrade 2 tournaments and two Grade 1 events organised by the ITF thisseason.
In February, the HCM City youngster won thedoubles titles at the Malacca International U18 Junior Championship inMalaysia and the Tennis Central U18 ITF Summer Championship in NewZealand.
Thien also became the first Vietnamese player to take part in the Australian Open U18 Tournament this year./.