Women's Rugby World Cup 2017 continued in Ireland on Sunday with plenty of tries and talking points.

New Zealand were the most emphatic winners of the day with a 121-0 defeat of tournament newcomers Hong Kong, while Japan gave hosts Ireland an almighty scare and forced them to come from 14-0 down to keep alive their semi-final hopes.

We take a look at five lessons to take away from a second day that also saw victories for defending champions England, Canada, USA and France.

Match Day Highlights: New Zealand v Hong Kong

1. Portia Woodman – Where else to start but with New Zealand's eight-try star? The winger had one of those days and would have had equalled the Black Ferns' 21-year-old record of nine tries in a match had it not been for a try-saving tackle from Hong Kong scrum-half Jessica Ho early on.

Her record now reads 18 tries in 13 tests which any winger in international rugby would be proud to call their own. That's on top of 142 tries on the HSBC World Rugby Women's Sevens Series since it began in 2012-13 and she has twice crossed for five tries in a match for the Black Ferns Sevens on the series, both in 2014-15 when she finished the season with a haul of 52.

She already has a RWC Sevens title, four series titles, a World Rugby Women's Sevens Player of the Year accolade and an Olympic silver medal to her name, will she be able to add a 15s crown to that this month? And to think, had sevens not become an Olympic sport, Woodman may never have picked up a rugby ball. Rugby's gain is most definitely netball's loss, although her opponents may not feel that way as she leaves them for dead with her pace and electric footwork!

2. Size isn't everything – Japan's starting pack gave away 78kg to their Irish counterparts but you would never have known it in the first half of their Pool C match on Sunday, the Sakura 15 enjoying the upper hand in the scrums and also being awarded a penalty try by referee Ian Tempest. Japan may have been denied the biggest shock in WRWC history with Ireland's second-half comeback, but they showed that rugby truly is a game for all shapes and sizes. Can they find an 80-minute performance against Australia to record only their second win in WRWC history? 

3. Tries not penalties – A clear trend that has emerged across the two match days is the lack of penalties attempted by teams in comparison to the 2014 tournament in France. On day one in 2014, 11 penalties were successfully kicked with Ireland and Australia accounting for three apiece. In 2017, there have been just three successfully kicked across 12 matches, the first by Italy fly-half Veronica Schiavon in their loss to England on Sunday with Canada's Magali Harvey and Ireland's Nora Stapleton the only others to attempt a penalty. That compares to 21 across the first two days of France 2014.

There has been a 50 per cent increase in the number of tries scored across this same period, but is that down to a change in mindset of teams who know that try bonus points and points scored could be the difference between a place in the semi-finals or the end of their title dreams? In years gone by Canada and New Zealand may well have eased off against Hong Kong once the match was won, but piling on the points gives them the best chance of claiming the best runner-up spot should they lose their mouth-watering Pool A decider.

New Zealand know the agony of missing out on the semi-finals, the 11 points they accrued as Pool B runners-up at WRWC 2014 not enough after England and Canada played out a draw to give the latter the best runner-up spot with 12 points. The Black Ferns won't want to suffer that fate again and unfortunately for Hong Kong, the four-time champions were at their most lethal on Sunday, converting nearly every opportunity into points on the board. 

Top 5: Tries from match day two at Women's Rugby World Cup
Five great scores from the second match day at Women's Rugby World Cup 2017

4. Flying under the radar – Defending champions England, four-time champions New Zealand, 2014 runners-up Canada, bronze medallists France and hosts Ireland were all mentioned as title contenders coming into the tournament, but few had included 1991 champions USA on that list. That was perhaps unsurprising given the Women's Eagles had lost their last eight internationals before arriving in Ireland, although those matches had all come against the top four nations in England, New Zealand, Canada and France.

However, Pete Steinberg's charges have quietly gone about their business at WRWC 2017 and picked up bonus point wins over Italy and Spain to sit behind England on points difference in Pool B ahead of their match on Thursday. That means they currently occupy the best runner-up spot ahead of the more fancied Canada and Ireland. Can they reach the semi-finals for the first time since 1998?

5. Hungry for more – Women's Rugby World Cup 2017 continues to capture interest on social media with a 250 per cent increase in #WRWC2017 mentions and the tournament on social channels from match day one. The online video views in 24 hours also rose to 5.2 million, an increase of 18 per cent on day one. There was also an uplift of 57 per cent in views of the live stream on World Rugby social platforms. 

Tell us what you thought of day two @WorldRugby using #WRWC2017.