Third-round action at the WTA continues Mon, 5 Oct, 2:00 pm AEDT with Jelena Ostapenko hosting Elise Mertens. This is a proper payoff match: a top-20 campaigner in Mertens against a dangerous former top-10 in Ostapenko, and both arrive with wins under their belts. For anyone hunting tennis predictions, this one is textbook value-hunting territory — the market has a clear favourite, but the facts leave room to be bold.

Both players are coming off wins in their most recent starts. Ostapenko's latest result is recorded as W 7 7–6 5 v Paula Badosa (H), and Mertens' most recent is W 6 4 7–0 6 5 v Katie Volynets (A). Those results suggest match sharpness and a willingness to grind through tricky scorelines.

Ranking and season form set the scene: Mertens sits at No.19 with a 31-19 year-to-date record and a 62% win rate, while Ostapenko is No.32 with a 23-19 record and a 55% win rate. Those numbers explain why Mertens is the board favourite, but they don't shut the door on a home upset or a tight encounter that fits our value gameplan.

Who will win? The match-winner case

The head-to-head market is straightforward: Elise Mertens is the favourite on the board. Her season so far (31-19) and higher ranking (No.19) give her the edge on paper, and the win odds reflect that. That said, Ostapenko's home form is tangible — her three most recent home outings listed in the pack are all wins — and she's coming off a win too.

The pair have a tiny head-to-head footprint: the pack records a 1-0 H2H split in Ostapenko's favour, with their meeting in Oct 2019 listed. So while the historical sample is limited, Ostapenko has beaten Mertens before and knows how to trouble her.

This is a coin-flip on raw form: Mertens brings year-long consistency and a higher ranking; Ostapenko brings home momentum and a recent run of wins at the venue. The board favourite is clear, but the conditions and Ostapenko's home sequence make bettors lean carefully rather than blindly back the chalk.

Head to HeadOdds correct as at 9:14 pm AEDT. Odds can change.
Jelena Ostapenko2.50Our tipElise Mertens1.54
Solid leanOur tip: Elise Mertens. Mertens is the board favourite with the stronger year-to-date record (31-19) and higher ranking (No.19); backing the favourite is the straight play if you trust season form.

Tipped at $1.54 (8:13 pm AEDT). Opinion, not a guarantee. Gamble responsibly — 18+.

Head-to-head context

1–0

Jelena Ostapenko vs Elise Mertens

Indoor1-0
0%1st set → match win % (H2H)0%
100%Deciding set win % (H2H)0%
72%1st serve points won %55%
47%Return points won %39%

Sets line — the handicap angle

The line on the board is 1.5 sets (home). In the pack the home line is 1.5 sets, with the home side priced at the lower line price and the away side carrying the longer price. That means Ostapenko is being treated as getting a 1.5-set start, the market pricing the underdog/home player as a comfortably playable handicap.

Support for taking Ostapenko +1.5 comes from her strong home sequence in the pack — three home results listed as wins — and the fact both players are coming off wins and will likely meet each other in competitive sets. If you prefer the conservative, value-first approach, the home +1.5 sets line is where the value sits against a worried favourite.

SetsOdds correct as at 9:14 pm AEDT. Odds can change.
Our tipJelena Ostapenko +1.51.55Elise Mertens -1.52.35
Solid leanOur tip: Jelena Ostapenko +1.5. Ostapenko has solid home form in the pack and the market gives her a 1.5-set start, which looks like value against a higher-ranked but beatable Mertens.

Tipped at $1.55 (8:13 pm AEDT). Opinion, not a guarantee. Gamble responsibly — 18+.

Set handicap (±1.5) form

−1.5 cover = won by two or more sets. Charts use recent completed scorelines.

Jelena Ostapenkolast 5

−1.5 cover rate40%2/5
+1.5 cover rate60%3/5
Straight-sets wins40%2/5

Elise Mertenslast 4

−1.5 cover rate25%1/4
+1.5 cover rate75%3/4
Straight-sets wins25%1/4
40%−1.5 cover % (form)25%
H2H −1.5 cover (Jelena Ostapenko)0%0/1

Totals — will this be a long match?

The games total is 21.5 games on the board (labelled Games). The market prices over and under accordingly. Both players' recent results in the pack show sets with tiebreak-style scores and extended games — Ostapenko's most recent result includes a 7–6 set and Mertens' recent scorelines also contain extended sets — which argues the match could clear 21.5 games.

If you expect tight sets and at least one tiebreak or extended set, the over 21.5 games line is the obvious lean. Conversely, a straight-sets, quick affair would fall under that line — but form snippets in the pack nudge us towards expecting more than 21.5 games.

GamesOdds correct as at 9:14 pm AEDT. Odds can change.
Our tipOver 21.51.85Under 21.51.95
Solid leanOur tip: Over 21.5. Both players' recent results feature extended sets and tiebreak-style scores in the pack, so the match has live potential to exceed 21.5 games.

Tipped at $1.85 (8:13 pm AEDT). Opinion, not a guarantee. Gamble responsibly — 18+.

Match total games

Average games from recent scorelines · marker shows live line 21.5.

Jelena Ostapenko matches (n=5)avg 20vs 21.5
1630
Elise Mertens matches (n=4)avg 23.8vs 21.5
1630
H2H meetings (n=1)avg 26vs 21.5
1630

Hit rate vs 21.5

Jelena Ostapenkon=5
Over 40%Under 60%
Elise Mertensn=4
Over 50%Under 50%
H2Hn=1
Over 100%Under 0%
8.8Avg games won (form)12

Risks to the calls

Mertens' season-long consistency and superior ranking are the clearest risk to any Ostapenko-based play; if Mertens brings her usual level this is a match she can close in straight sets.

Ostapenko's form is house-biased — several of her freshest wins are at home — and that home momentum underpins the handicap play, but limited recent head-to-head history and Mertens' stronger year-to-date record keep this from being a high-confidence slam.

Summary verdict: the market favourite is Mertens on the head-to-head, but the value sits with Ostapenko on the handicap and with the over on games if you expect tight sets and at least one extended set. Be selective and size stakes to the risk.