There are seven singles matches on Tuesday’s schedule of the PTT Thailand Open, highlighted by the much-anticipated return of No. 5 seed and 2009 US Open champion Juan Martin del Potro.

The 22-year-old Argentine, who underwent right wrist surgery on May 4, is playing his first match since a five-set fourth round loss to Marin Cilic at the Australian Open on Jan. 24. This is the Tandil native’s second tournament of the year and he comes in ranked No. 36. He reached a career-high No. 4 on Jan. 11.

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He will face Belgian Olivier Rochus for the first time in the featured evening match. Last season del Potro won three hard court titles (Auckland, Washington, US Open) and finished a year-end best No. 5. He concluded the season with a runner-up effort at the Barclays ATP World Tour Finals in London.

In the first match of the day, top Israeli Dudi Sela takes on Russian qualifier Konstantin Kravchuk, who defeated ’07 Bangkok champion Dimitry Tursunov in the last round of qualifying on Monday.

In the second match, Rainer Schuettler, who at 34, is the oldest player in the singles draw, faces Brazilian No. 2 Ricardo Mello, who won the previous meeting five years ago in the first round of Munich.

In the third match, Jarkko Nieminen of Finland plays Thai wild card Danai Udomchoke for the second time. The Finnish left-hander won the first meeting 6-4, 6-1, in the opening round of this tournament seven years ago.

There is one other seed in action, No. 8 Michael Berrer of Germany, is on Court 1 against Spaniard Guillermo Garcia-Lopez.

TUESDAY FIRST ROUND HEAD-TO-HEADS  - In Order of Play by Court

Centre Court

Dudi Sela (ISR) vs (Q) Konstantin Kravchuk (RUS) First ATP Meeting
Other Meeting:
08 Donetsk CH (Ukraine) Hard R16 Konstantin Kravchuk 7-5 6-2

Sela FastFacts:
2010 Highlights:
SF: Chennai (l Wawrinka); QF: London / Queen's Club (l Schuettler)
YTD W-L: 15-19
YTD Titles: 0
Career Titles: 0
Date of Birth: April 4, 1985
South African Airways 2010 ATP Ranking: 85

Kravchuk FastFacts:
2010 Highlights:
YTD W-L: 0-0
YTD Titles: 0
Career Titles: 0
Date of Birth: February 23, 1985
South African Airways 2010 ATP Ranking: 134

Rainer Schuettler (GER) vs Ricardo Mello (BRA) Mello Leads 1-0
05 Munich (Germany) Clay R32 Ricardo Mello 6-4 6-2

Schuettler FastFacts:
2010 Highlights:
SF: London / Queen's Club (l Querrey); QF: Los Angeles (l Querrey)
YTD W-L: 10-15
YTD Titles: 0
Career Titles: 4
Date of Birth: April 25, 1976
South African Airways 2010 ATP Ranking: 90

Mello FastFacts:
2010 Highlights:
SF: Costa Do Sauipe (l Ferrero)
YTD W-L: 7-10
YTD Titles: 0
Career Titles: 1
Date of Birth: December 21, 1980
South African Airways 2010 ATP Ranking: 80

Jarkko Nieminen (FIN) vs (WC) Danai Udomchoke (THA) Nieminen Leads 1-0
03 Bangkok (Thailand) Hard R32 Jarkko Nieminen 6-4 6-1

Nieminen FastFacts:
2010 Highlights:
SF: Delray Beach (l Gulbis); QF: Metz (l Zverev)
YTD W-L: 17-22
YTD Titles: 0
Career Titles: 1
Date of Birth: July 23, 1981
South African Airways 2010 ATP Ranking: 60

Udomchoke FastFacts:
2010 Highlights:
YTD W-L: 0-0
YTD Titles: 0
Career Titles: 0
Date of Birth: August 11, 1981
South African Airways 2010 ATP Ranking: 686

Olivier Rochus (BEL) vs (5) Juan Martin del Potro (ARG)   First Meeting

Rochus FastFacts:
2010 Highlights:
F: Newport (l Fish); QF: Nice (l Gasquet)
YTD W-L: 15-20
YTD Titles: 0
Career Titles: 2
Date of Birth: January 18, 1981
South African Airways 2010 ATP Ranking: 78

Del Potro FastFacts:
2010 Highlights:
YTD W-L: 3-1
YTD Titles: 0
Career Titles: 7
Date of Birth: September 23, 1988
South African Airways 2010 ATP Ranking: 36

Court 1

(Q) Ryler DeHeart (USA) vs Mikhail Kukushkin (KAZ)   First Meeting

(Q) Ruben Bemelmans (BEL) vs (Q) Frederik Nielsen (DEN) First ATP Meeting
Other Meeting:
07 Great Britain F19 (Great Britain) Hard R16 Frederik Nielsen 6-4 6-2

Guillermo Garcia-Lopez (ESP) vs (8) Michael Berrer (GER)  First Meeting