Sunday will mark the fourth and final round of voting in two months as France finishes its legislative elections.

The key number to watch as returns come in is 289 — that’s the number of seats that President François Hollande’s Parti socialiste (and its allies) will need in order to hold an absolute majority in the Assemblée nationale.  In the first round last Sunday, the Parti socialiste won 29% to just 27% for the center-right’s Union pour un mouvement populaire — the broad left expected to line up behind Hollande, however, received almost 47% of the vote.  As such, it is expected that the French left will command a majority of the seats after Sunday’s runoff — the question is whether the Socialists will need to govern in coalition with France’s Green Party (Europe Écologie – Les Verts), with which the Parti socialiste has an electoral pact or, more broadly, with the far-left Front de gauche.

But there are many individual races worth watching as well.  So without further ado, here are 15 races to keep an eye on:

• Charente-Maritime 17. This is the race that has kept the French media abuzz for the past week, as Ségolène Royal won the first round with just 32% to 29% for the local unaffiliated socialist candidate, Olivier Falorni.  The UMP candidate won 20%, but did not qualify for the runoff.  Royal, Hollande’s former partner and the mother of his children, is one of the most charismatic politicians in France and, of course, the Parti socialiste‘s presidential candidate in 2007.  Royal was expected to do much better, and it had been predicted that she would, in fact, be Hollande’s choice as president of the Assemblée nationale.  Indeed, everyone from prime minister Jean-Marc Ayrault to Parti socialiste president Martine Aubry have called on Falorni to step aside, and Hollande even personally endorsed Royal — Falorni has refused, and a poll earlier this week showed Falorni with 58% support in the runoff to just 42% for Royal. But the race became even more explosive when Hollande’s current partner, Valérie Trierweiler, expressed her support for Falorni on Twitter, setting off a media firestorm about Trierweiler’s motives and the propriety of her very personal intrusion into politics.  No matter who wins, this race has already caused Hollande significant harm, dredging up some of the worst memories of the personal love life of former president Nicolas Sarkozy that French voters found so distasteful.

• Pas-de-Calais 11. This is the race that had previously been the most-watched race prior to the first round — hard-right Front national leader Marine Le Pen chose this Hénin-Beaumont constituency in northern France as a showcase of her party’s message of economic populism.  Far-left Front de gauche leader Jean-Luc Mélenchon chose to contest her in the same district, setting up a direct battle between two of the most iconic figures on the French political scene: Le Pen and Mélenchon were the third-place and fourth-place finishers in the first round of April’s presidential election.  Le Pen won the first round with an impressive 42%, while the local Parti socialiste candidate Philippe Kemel finished in second place with 23.5%, edging out Mélenchon with just 21.5%. Mélenchon withdrew from the runoff in favor of Kemel, who is now a slight favorite to win.  If Le Pen pulls off a victory here, though, it will be a significant sign of strength for the Front national, which is hoping to win its first seat in the parliament since the 1997 election, and could win a handful of seats across France.