No.5 seed Ekaterina Alexandrova has won 16 of her past 18 indoor matches - a run that includes the Russian's maiden WTA final in Linz last October, her second 125K title in Limoges and her first Premier quarterfinal in St. Petersburg.
Qualifier Greta Arn is competing in her first WTA-level main draw since the 2013 Australian Open, and bidding for her first win at this level since the 2012 US Open, where she defeated Agnes Szavay via retirement. The 39-year-old retired following Wimbledon 2013 but returned to the game in June 2017; her qualifying wins over Ekaterine Gorgodze and Paula Badosa Gibert were the third and fourth Top 200 victories of her comeback so far. Arn's last Top 100 win was over Shahar Peer in Sydney qualifying in 2013.
Defending champion and No.1 seed Alison Van Uytvanck is pitted against one of only two players in the main draw who have been ranked inside the Top 10, former World No.2 Vera Zvonareva. The Russian has already reached two semifinals in 2019, in Shenzhen and St. Petersburg.
Irina-Camelia Begu has a 2-0 record over Mona Barthel, having defeated the German 6-0, 1-6, 7-6(7) in the first round of the Cagnes-sur-Mer ITF W100 event in 2011 and 7-5, 6-4 in the first round of Seoul last year.
Qualifier Tereza Smitkova, who reached the fourth round of Wimbledon in 2014 and reached a career high of World No.57 the following year, won her first WTA main draw match since Luxembourg 2016 over Ysaline Bonaventure on Tuesday and will now bid for her second career quarterfinal (following Shenzhen 2015) against No.3 seed Pauline Parmentier.
Georgina Garcia Perez has navigated through Budapest qualifying for the second consecutive year; 2018 saw the Spaniard make her WTA main draw debut here, losing to Aleksandra Krunic. Garcia Perez is on a four-match winning streak, having been instrumental in her country's Fed Cup World Group II first-round defeat of Japan two weeks ago: the 26-year-old went undefeated in both singles (against Misaki Doi and Nao Hibino) and the deciding doubles, partnering María José Martínez Sánchez to beat Miyu Kato and Makoto Ninomiya.
ORDER OF PLAY (all courts start 11am)
[Q] Greta ARN (HUN) vs Ekaterina ALEXANDROVA (RUS) 
Andrea PETKOVIC (GER)  vs Anastasia POTAPOVA (RUS)
Alison VAN UYTVANCK (BEL)  vs Vera ZVONAREVA (RUS)
Not before 5pm
[WC] Fanny STOLLAR (HUN) vs Madison BRENGLE (USA)
Sorana CIRSTEA (ROU) vs Aleksandra KRUNIC (SRB) 
Pauline PARMENTIER  vs [Q] Tereza SMITKOVA (CZE)
Mona BARTHEL (GER) vs Irina-Camelia BEGU (ROU)
Marketa VONDROUSOVA (CZE)  vs [Q] Georgina GARCIA PEREZ (ESP)
Not before 1pm
[WC] Reka-Luca JANI (HUN) / Cornelia LISTER (SWE) vs Paula KANIA (POL) / Yana SIZIKOVA (RUS)
Kirsten FLIPKENS (BEL) / Johanna LARSSON (SWE)  vs Naomi BROADY (GBR) / Storm SANDERS (AUS)
Jessica MOORE (AUS) / Alexandra PANOVA (RUS)  vs Anna BLINKOVA (RUS) / Anastasia POTAPOVA (RUS)