That's the word on the street. Haven't played it myself, so I can't confirm.

Ya, and I ain't going to import a title from a franchise I didn't fall in love with either (which is funny because you know I am sucker for Gundam). 

Media Create

[N64] Mario Tennis (Nintendo) {2000.07.21} (¥6.800) - 319.434 / 1.065.469
[GMB] Mario Tennis GB |GameBoy Color| (Nintendo) {2000.11.01} (¥3.800) - 143.871 / 334.741
[GBA] Mario Tennis: Power Tour (Nintendo) {2005.09.13} (¥3.618) - 33.870 / 114.599 <42,49%>
[3DS] Mario Tennis Open (Nintendo) {2012.05.24} (¥4.571) - 101.645 / 396.604 <51,19%>
[WIU] Mario Tennis: Ultra Smash (Nintendo) {2016.01.28} (¥4.700) - 55.331 / 139.405 <73,01%>
[3DS] Mario Tennis Open [Nintendo Selects] (Nintendo) {2016.09.15} (¥2.700) - 1.586 / 17.410 <9,47%>
[NSW] Mario Tennis Aces (Nintendo) {2018.06.22} (¥5.980) - 123.774

[360] Minecraft: Xbox 360 Edition (Microsoft Game Studios) {2013.06.06} (¥1.980) - 4.268 / 30.858 <76.19%>
[XB1] Minecraft: Xbox One Edition # (Microsoft Game Studios) {2014.11.27} (¥2.000)- 324 / 3.178 <18,14%>
[PSV] Minecraft: PlayStation Vita Edition # (Sony Computer Entertainment) {2015.03.19} (¥2.400) - 36.151 / 1.276.619 <60,37%>
[PS4] Minecraft: PlayStation 4 Edition (Sony Computer Entertainment) {2015.12.03} (¥2.400) - 4.630 / 150.221 <21,90%>
[WIU] Minecraft: Wii U Edition (Microsoft Game Studios) {2016.06.23} (¥3.600)- 22.589 / 257.654 <49,59%>
[NSW] Minecraft (Microsoft Game Studios) {2018.06.21} (¥3.600) - 61.764

[PS3] Gundam Breaker (Bandai Namco Games) {2013.06.27} (¥7.600) - 200.564 / 269.752 <83.54%>
[PSV] Gundam Breaker # (Bandai Namco Games) {2013.10.31} (¥6.648) - 33.775 / 91.731 <68.64%>
[PSV] Gundam Breaker 2 (Bandai Namco Games) {2014.12.18} (¥6.640) - 57.188 / 140.808 <76.07%>
[PS3] Gundam Breaker 2 (Bandai Namco Games) {2014.12.18} (¥7.600) - 66.532 / 125.382 <72.09%>
[PS3] Gundam Breaker 2 Omochidashi Pack {PlayStation 3 PlayStation Vita} (Bandai Namco Games) {2014.12.18} (¥11.800) - 5.150 / 5.444 <80.00%>
[PSV] Gundam Breaker 3 (Bandai Namco Games) {2016.03.03} (¥6.800) - 74.639 / 124.226 <87,99%>
[PS4] Gundam Breaker 3 (Bandai Namco Games) {2016.03.03} (¥7.600) - 66.580 / 95.492 <93,33%>
[PS4] New Gundam Breaker # (Bandai Namco Games) {2018.06.21} (¥7.600) - 63.790

Here is the week 25 update in terms of the two big consoles in Japan's path to be able to reach the commonly stated (in these sales threads) estimates for 2018 sales (2 mil for PS4, 4 mil for Switch) .

TWS - This week's sales
GD - Goal differential, the difference between the average week needed from last week compared to this week's sales
YTD - Units sold in 2018 so far including this week's sales
AWN - Average weekly sales needed to reach the estimate for the console.

Switch basically flat with Minecraft and Mario Tennis releasing. PS4 drops 20% due to poor New Gundam Breaker reception and end of the Days of Play sale.

Also I find it completely hilarious over on the era MC thread how they're all hyping FIFA 18 on Switch appearing at the bottom of the list yet completely miss Winning Eleven on PS4 ranking higher. Nintendo fanboys, please if you're going to circlejerk about one football game's success to the World Cup (everyone bought FIFA 18 on Switch) then at least acknowledge the football game that sold better.

You and me both.

Thank you for putting together this great list.

Well I didn't I just found it from somewhere else and thought it was an interesting comparison.

Ignoring the silly last part, I am amazed (looking at the table) at how the Switch outsold the PS4 2018 total so far with a game like Monster Hunter World out exclusively on PS4 in Japan. The shortages are long gone, so I expected way more sales. MHW isn't even appearing on the chart anymore (this one at least).

MHW was a flash in the pan both in Japan and WW.