The second round wraps up at the Studena Croatia Open Umag on Thursday, with the last four quarter-final spots at stake.

First up on Centre Court is No. 2 seed Jurgen Melzer against Jan Hajek. Melzer has had his best season to date and last week he reached his first ATP World Tour final of the year at the German Open in Hamburg. The Austrian has reached the semi-finals in his only two previous appearances here as well, in 2002 and last year. Hajek’s ranking wouldn’t indicate an upset brewing (he is 63 spots below Melzer at No. 78), but he did beat his opponent’s young brother, Gerald, in the first round here.

Second on Centre Court is No. 3 seed and No. 2 Croat Ivan Ljubicic against wild card Ivan Dodig. Ljubicic will try to snap out of a four-match losing streak, having gone winless since a 10-8 fifth set second round win at Roland Garros. But the 31-year-old Croat is comfortable on these courts, playing this tournament for the 11th time (his best showings were the semi-finals in 1999 and three other quarter-finals). He and Dodig will be playing for the first time.

Two all-unseeded match-ups take the Grandstand, pitting Olivier Rochus against Andreas Seppi (Seppi won their only prior meeting, albeit by retirement) and Bjorn Phau against Potito Starace, who won their previous encounter.

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THURSDAY SECOND ROUND HEAD-TO-HEADS - In Order of Play by Court

Centre Court

Jan Hajek (CZE) vs (2) Jurgen Melzer (AUT)    First Meeting

Hajek FastFacts:
2010 Highlights:
QF: Munich (l Youzhny)
YTD W-L: 11-15
YTD Titles: 0
Career Titles: 0
Date of Birth: August 7, 1983
South African Airways 2010 ATP Ranking: 78

Melzer FastFacts:
2010 Highlights:
F: Hamburg (l Golubev); SF: Zagreb (l Cilic); Dubai (l Youzhny); Roland Garros (l Nadal); QF: Auckland (l Clement); Rotterdam (l Davydenko); ATP World Tour Masters 1000 Madrid (l Almagro); Stuttgart (l Montanes)
YTD W-L: 34-17
YTD Titles: 0
Career Titles: 2
Date of Birth: May 22, 1981
South African Airways 2010 ATP Ranking: 15

(3) Ivan Ljubicic (CRO) vs (WC) Ivan Dodig (CRO)   First Meeting

Ljubicic FastFacts:
2010 Highlights:
W: ATP World Tour Masters 1000 Indian Wells (d Roddick); QF: Dubai (l Djokovic)
YTD W-L: 16-10
YTD Titles: 1
Career Titles: 10
Date of Birth: March 19, 1979
South African Airways 2010 ATP Ranking: 16

Dodig FastFacts:
2010 Highlights:
YTD W-L: 5-3
YTD Titles: 0
Career Titles: 0
Date of Birth: January 2, 1985
South African Airways 2010 ATP Ranking: 153

Grandstand

Olivier Rochus (BEL) vs Andreas Seppi (ITA)  Seppi Leads 1-0
10 ATP Masters 1000 Monte Carlo  Clay R64 Andreas Seppi 7-6(3) ret

Rochus FastFacts:
2010 Highlights:
F: Newport (l Fish); QF: Nice (l Gasquet)
YTD W-L: 13-18
YTD Titles: 0
Career Titles: 2
Date of Birth: January 18, 1981
South African Airways 2010 ATP Ranking: 66

Seppi FastFacts:
2010 Highlights:
SF: Hamburg (l Melzer); QF: Båstad (l Soderling)
YTD W-L: 18-19
YTD Titles: 0
Career Titles: 0
Date of Birth: February 21, 1984
South African Airways 2010 ATP Ranking: 55

Bjorn Phau (GER) vs Potito Starace (ITA)  Starace Leads 1-0
10 Hamburg (Germany) Clay R64 Potito Starace 7-5 6-0

Phau FastFacts:
2010 Highlights:
YTD W-L: 6-9
YTD Titles: 0
Career Titles: 0
Date of Birth: October 4, 1979
South African Airways 2010 ATP Ranking: 97

Starace FastFacts:
2010 Highlights:
SF: Casablanca (l Wawrinka); Nice (l Gasquet); QF: Sydney (l Gasquet); Hamburg (l Melzer)
YTD W-L: 18-17
YTD Titles: 0
Career Titles: 0
Date of Birth: July 14, 1981
South African Airways 2010 ATP Ranking: 64