Lukáš Lacko (Slovak pronunciation: [ˈlukaːʃ ˈlat͡sko], LOO-kahsh LAHT-skoh; born 3 November 1987) is a professional Slovak tennis player. His career-high ATP singles ranking is World No. 44, achieved in January 2013.
Juniors
As a junior Lacko compiled a singles win/loss record of 88–39, reaching as high as No. 3 in the combined junior world rankings in February 2005.
Junior Grand Slam results:
Australian Open: QF (2005)
French Open: SF (2005)
Wimbledon: 1R (2004)
US Open: 2R (2005)
Pro tour
At the 2010 Australian Open, he lost in the second round to World No. 2 and defending champion Rafael Nadal 2–6, 2–6, 2–6. At the 2010 French Open, he played and won the longest match of his career in the first round against American Michael Yani with the score at 6–4, 6–7, 6–7, 7–6, 12–10. The 4-hour, 56-minute match stretched over the course of two days, and tied the record for the most games played in the Open Era at the French Open.
Lacko continued his 2nd round streak in 2010 majors by defeating the 24th seed Marcos Baghdatis in four sets. He then lost a very tight five set 2nd round match against Jérémy Chardy.
Lacko played in the 2010 Atlanta Tennis Championships and upset former World No.1 Lleyton Hewitt 6–2, 6–4 to advance to the quarterfinals.
At the 2011 Qatar Open, he lost in the second round to Rafael Nadal, despite achieving the rare feat of winning a set against Nadal 6–0.
He reached his first singles ATP final in Zagreb 2012, where he lost to Mikhail Youzhny in straight sets.
At the 2014 French Open he lost in the first round to Roger Federer.
Key | W | F | SF | QF | #R | RR | Q# | A | P | Z# | PO | G | F-S | SF-B | NMS | NH |
(W) Won tournament; reached (F) final, (SF) semifinal, (QF) quarterfinal; (#R) rounds 4, 3, 2, 1; competed at a (RR) round-robin stage; reached a (Q#) qualification round; (A) absent; played in a (Z#) Davis/Fed Cup Zonal Group (with number indication) or (PO) play-off; won a (G) gold, (F-S) silver or (SF-B) bronze Olympic medal; a (NMS) downgraded Masters Series/1000 tournament; or (NH) tournament not held.
To avoid confusion and double counting, these charts are updated either at the conclusion of a tournament, or when the player's participation in the tournament has ended.
Current till 2017 Australian Open.
| Tournament | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | W–L |
| Grand Slam tournaments |
| Australian Open | 1R | 1R | A | 2R | 1R | 3R | 2R | 1R | 2R | Q1 | 3R | 7–9 |
| French Open | Q1 | Q1 | A | 2R | Q1 | 1R | 1R | 1R | 1R | A | | 1–5 |
| Wimbledon | Q1 | A | 1R | 2R | 1R | 3R | 1R | 1R | 1R | 3R | | 5–8 |
| US Open | Q3 | Q2 | Q3 | 1R | 1R | 1R | 1R | 1R | 1R | 1R | | 0–7 |
| Win–Loss | 0–1 | 0–1 | 0–1 | 3–4 | 0–3 | 4–4 | 1–4 | 0–4 | 1–4 | 2–2 | 2–1 | 13–29 |
| Career statistics |
| Titles–Finals | 0–0 | 0–0 | 0–0 | 0–0 | 0–0 | 0–1 | 0–0 | 0–0 | 0–0 | 0–0 | 0–0 | 0–1 |
| Year-End Ranking | 139 | 325 | 82 | 89 | 112 | 51 | 81 | 95 | 110 | 122 | | |